{
  "manageEntity": {
    "action": "Save",
    "entityId": "153691639",
    "entityType": "Track",
    "nonce": "1785444854782028315",
    "signature": "0xadf4c6b77e9c9249b5eb4023355fc7ce5a1363d86e6454e6368436500af8d0b53bb335111f37e55e9560e6d26907b887388166b7e089001de46dbabda25112f21c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}