{
  "manageEntity": {
    "action": "Save",
    "entityId": "669192019",
    "entityType": "Track",
    "nonce": "0x9fdc2b25ebddd063208a6ab0a461eb11d0e079724c0086594fb863a9a0340f87",
    "signature": "0xd27a53d0125dfac8ad771313fccdfc64d30dc11216ea05d60e0869b57d8e6f15466aadfd360014e30a966632cfa30834c031b37517ca363bbfff7a1fa80e48521c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}