{
  "manageEntity": {
    "action": "Save",
    "entityId": "1872366663",
    "entityType": "Track",
    "nonce": "0x74fdc1d19786e6c44f7f01584bf93875d2279d0b851898e7c22628ddcce56881",
    "signature": "0x78855d848bed6f4238141da8de39fc7cabf455cc7919f58471d520fa39dc26dd05555369c7557f8ce23969234f1f50870f47cfa9cfb370a6231cd5aa0e3fa2771c",
    "signer": "0x326CA1756d3c5F6540Bae1A21EcE78481b3b115C",
    "userId": "127591928"
  }
}