{
  "manageEntity": {
    "action": "Save",
    "entityId": "1256747986",
    "entityType": "Track",
    "nonce": "0x0d690a858192b53491182cab95655e09b86319eb3b8d571667997cd5b470f7bb",
    "signature": "0xdab4af21243de216359a5dacf94b5f5d1984d10df65e53444d5ff543bea65823327ca97127aaf3b0871ef188999bc9f07d0b112cba25fa4d74954d5869fe2afb1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}