{
  "manageEntity": {
    "action": "Save",
    "entityId": "1154225532",
    "entityType": "Track",
    "nonce": "0x2c09cb7e61e461701e1c993083ef4b1250cf18c97df0b32e7a5802ec1ea7b136",
    "signature": "0x6109aca20135507285e182517219a83c35a13fa202d18e125529c7c3a54865e832fef554780ec75db3802c8919a325084fbae8abaa2c093b10567324609333021b",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}