{
  "manageEntity": {
    "action": "Save",
    "entityId": "489614",
    "entityType": "Track",
    "nonce": "0xfabd19197e978674981b0078992675f31ea9f8447928881a11177bb5d2a2eaa8",
    "signature": "0x3c28994479774fe6fd8c0a86db6530d51728a58c7d50946fb27add1b2fce7a810b557230fa258dcf6b2fbd8f6ba32d9fe6349857b3538aea548464329c12dcd71c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}