{
  "manageEntity": {
    "action": "Save",
    "entityId": "142574",
    "entityType": "Track",
    "nonce": "0xb39938697d96e21a3aa13067c2b7803bc5412cc74823fcc49a675fd9f9f29f54",
    "signature": "0x20e17f59545fd10ca30df7b7f3ccd1f794c1f06dd58114a13ff4026b90c529f26d935f6beb34f03d3e5f89aabe705694bf4da2df0089039cc6700b4fb6a5a74e1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}