{
  "manageEntity": {
    "action": "Save",
    "entityId": "205974",
    "entityType": "Track",
    "nonce": "0xeca5df5cf4250b4ecd43ac648af963ec002c0752d2391ca55b81a46aaddbe278",
    "signature": "0xd6e287306b6bec9d3aedd4166d5b643a3f0c633a4f2788bd81e73f529842edf56447e8e737932a413e28798934b27ae0dd7e978ca6f86babfdb45678b74a08091c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}