{
  "manageEntity": {
    "action": "Save",
    "entityId": "1493733658",
    "entityType": "Track",
    "nonce": "0xedaa616381a89179ec554a65ef4459fa4191982dcf7c2b14d83110f7110a51d5",
    "signature": "0x740a7feee0340505adc9796172399713421eb6dbb9084f44bccb35820439274663c9df9821837c136d6fd34cd2e44b99643504f900594858a3cf179f44081daa1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}