{
  "manageEntity": {
    "action": "Save",
    "entityId": "767991",
    "entityType": "Track",
    "nonce": "0x9649d8179abedbf42bcdb78b03b1249bc6e0bfdd6c28e3b8005e6f975424d078",
    "signature": "0x4079338397d65793b730681db72623cc77fdc9c015b0155198f330624293c6007606bfceb614a80022a8a1790caf593730809da5bd93fc5f939059383d02ff1b1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}