{
  "manageEntity": {
    "action": "Save",
    "entityId": "906856730",
    "entityType": "Track",
    "nonce": "0xe0a0397c84ff38004d3160ad6fece6505e294b56be3174b244691dd8c610065f",
    "signature": "0x57c947b04023ef61e5599040ab73cae18d36ffce92d017a6c116b2bac37ef61932b808c2b5526b7f859d89ad5790c1151161847d2e3a1f4bfb7e37c975250aa91b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}