{
  "manageEntity": {
    "action": "Save",
    "entityId": "752260775",
    "entityType": "Track",
    "nonce": "0x705b0d1ab4e84428dedb7976a42b1d3fb05c693a6d1bf3b00eb7543323025e8a",
    "signature": "0xaa8c231cdfa5babb54c0ce40e2720f5b8dc2dbcb96bb9d0049b2bf09080e7a4c3567590ce864c27c3a374584a7da8928a470c61b931051364bc21ca51e7073761c",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}