{
  "manageEntity": {
    "action": "Save",
    "entityId": "543507",
    "entityType": "Track",
    "nonce": "0x12df838b4efc9214d376e2d4ffaaf8ebf0fd941788f2db9f3383a930fe74fa8f",
    "signature": "0x746204b3e590ec71a8129cc2c212e4c7d7d25b59b2a60ed4f23c345d7ec4e7e72724c0d8c1c56e534833367cd86f77677215e653b81f38a6fa829fe5f3ec2ec61c",
    "signer": "0x64B0DA55A684D51d3EF114Fe644eac7db132fDb7",
    "userId": "121304325"
  }
}