{
  "manageEntity": {
    "action": "Save",
    "entityId": "221783",
    "entityType": "Track",
    "nonce": "0xb435124a28ff83d49271490bcaf3ab08845f2ed63ea19d9122e9f82d7376a378",
    "signature": "0x099509327c7c4f8740fd2d20f90ed8a1353f42eeb56d1c5b7c5a7fcbc663ac2347f90f824aae3323b638b5a08d6915971be7265ce37edcb11222e984eee1e4d71c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}