{
  "manageEntity": {
    "action": "Save",
    "entityId": "703797016",
    "entityType": "Track",
    "nonce": "1788047157019205800",
    "signature": "0xe324c30f16acdd55c6fee0d2e159415814d9b823bb2cb3aeb7ecb88ae6fa74e821e2488fd863be06fd400db0365b7c5ba739bf3ca74743d7195081d89c226a2c1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}