{
  "manageEntity": {
    "action": "Save",
    "entityId": "502216567",
    "entityType": "Track",
    "nonce": "0x984a3a159305de9f333e4ec33037935648082d03b41d1225b82a45c9a2a1f63f",
    "signature": "0xe37a834675ca91190f5204c3a9e14ae9921a24b1f749125ada6bf331a87c49e47aabbfac35dcb799326b37d681ac4dc991a98eaa94007c4c8d9351d7d91204a71b",
    "signer": "0xBD46d315142217685c7fE4aC6359DFfe663E7a4D",
    "userId": "409129"
  }
}