{
  "manageEntity": {
    "action": "Save",
    "entityId": "1942370312",
    "entityType": "Track",
    "nonce": "0x31c9d4e807a22d5ade4bf0842437f0554df0c8bd4ec9d4e24d6daeb2cbe44d1f",
    "signature": "0x6afa4cc121443d88193bfa8dba64d3d15fc266f077df2a1f6468e262b3b61a92522091a0dd909052ff1151ab14e84367896fce065e0a2309ff353d7845ba91d11b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}