{
  "manageEntity": {
    "action": "Save",
    "entityId": "661095305",
    "entityType": "Track",
    "nonce": "0x8f0ca1f0d81c729e63dd0d4bc185e93fd048a752aacb4197eca65d0ecb62ff03",
    "signature": "0xd5f48020b29e8f73d5259cff7abadd8f90914c1e92d47e65c5161c0fa2acf0c64d6798f3d9efb7ddbd01b79f544a1985b9cc521b31f6186d9c2e33babaaa250f1b",
    "signer": "0x06Ad5789cE045C5B0AeB97849051a7385CA95B4a",
    "userId": "270209897"
  }
}