{
  "manageEntity": {
    "action": "Save",
    "entityId": "1630844821",
    "entityType": "Track",
    "nonce": "0x96e68d0d80726f7db80fd31184477bb433b4eaa625c21d23ea3dee794475a31a",
    "signature": "0x4f9682e1c9fb2ff04e61b11ac9eb9edf18971c80d339cf95ee11c432f9c3691f47d8191fa40e3bf072842a648b274cee2c83407145ad6de91cfc6e0abc5e25b61b",
    "signer": "0x9881bA04eA95d8a4De5594aBC9DBd5c96F38eF34",
    "userId": "211307"
  }
}