{
  "manageEntity": {
    "action": "Save",
    "entityId": "661881533",
    "entityType": "Track",
    "nonce": "0x63d1f29b3193a0f318ca985e49c71ff7abcb78e342ef6496b43fda89308cb2a2",
    "signature": "0x33f2ec4c6f06f8ab74a9138b8e93c107c73ad110455782835e2aea293a8eb248353fc23a3a8b1c2c19e969f0d4821d651436049b05d7164fe0c40ed398b844f71b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}