{
  "manageEntity": {
    "action": "Save",
    "entityId": "664787302",
    "entityType": "Track",
    "nonce": "0xc3bcb59fdd7d34ab807b218cdee01b3f8541feb8f4d646123c14832ca97d4297",
    "signature": "0x6ac3c665351f77b14eedcef84dcf02a06a24d60e91cf375b02334999e620ea9709b8b9d87326da9117e9288caefd278cdfaab96851075cfcd33488b25ab6897e1c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}