{
  "manageEntity": {
    "action": "Save",
    "entityId": "1547015358",
    "entityType": "Track",
    "nonce": "0xc4b66acb0aabb6e74f1bc70d2f1b0f050de74e69db8644d371ad4df245541368",
    "signature": "0x954783abdc0a9309018fe981f7768b01defbc72cd832973e4e7dbb33dd22a7414263110125746cd720b9cc86ce2fb4bab73f686a02c743981d697580009e48c71b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}