{
  "manageEntity": {
    "action": "Save",
    "entityId": "1040734",
    "entityType": "Track",
    "nonce": "0x86ddde48f043d5289307539ec9f4aed6994f8a6cddac89cb27e1aff323490baf",
    "signature": "0xa8814ecccc634a3396a1a987afec2df8357fc2e60d7054fc077df1f25b5a95c003dc2db3edb1618d3f237b996e907a779e4a5412efd85a26e70ee39af3a4b9ed1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}