{
  "manageEntity": {
    "action": "Save",
    "entityId": "697858710",
    "entityType": "Track",
    "nonce": "0x18e01233ddb812856cb0c92fadf92e54a52d08a0f496bcc34855fae7e2c190ed",
    "signature": "0x5fd1d09e3a6ac7f5bbd18adef00430a7311fc01a1e118826cd7b13e0fc87013b3c1d388fe788d6b3fa714f9eac46aaf6400d8378c9a6c0d1e922f8d066444f661c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}