{
  "manageEntity": {
    "action": "Save",
    "entityId": "148050807",
    "entityType": "Track",
    "nonce": "0x420b7d80894adc30e0f925d1e3e4b6533590459d027aaf141686a5305d7225e2",
    "signature": "0xe9e30696f2ac76080aadfb098596c775a7ccca53bb5c033e099dad631c6c44aa1b864e30ba38ab013ea1a5b6d6ba9ba48a2a5e233fc6dd149f54f0593da5920a1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}