{
  "manageEntity": {
    "action": "Save",
    "entityId": "1233351268",
    "entityType": "Track",
    "nonce": "0x5700f76f107a86ea4246b5ff83389d30a88f3ea645ecebda532796e21be6dece",
    "signature": "0x7789b0ecfecb97683a3c4210d97dc7ae748941ac7df3dbf9200cfffb1632176f03d156bca247cf8adf35c18321404c82b460bc33c8ae65675761a6174e7209681b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}