{
  "manageEntity": {
    "action": "Save",
    "entityId": "368764657",
    "entityType": "Track",
    "nonce": "0x21221b14a725ee8e680876197af97e7b2007f8cd113033a671bc574474a39108",
    "signature": "0x81644d14d0f854ce25a13da9870da9c8d5362ca2544ae591a35ecb79d7ecb1fb08a7a07cf8809e5b042c2543560d8e76a01ea37a4fe4296d9dc401e8d195829c1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}