{
  "manageEntity": {
    "action": "Save",
    "entityId": "1871189741",
    "entityType": "Track",
    "nonce": "0xf355b73e71bbb86b50442b774e2b8cd49e84e922971892a07f15f1d571d061c6",
    "signature": "0xbf65d4d148d98f45417b28ca4ef21e201fa74b121d4e58bb060c043a659c1efc0ae663cfbcd367d35d455a0dda32c38e2bd3a4c9bc303c8a1b1bf43e3bb348501c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}