{
  "manageEntity": {
    "action": "Save",
    "entityId": "660668210",
    "entityType": "Track",
    "nonce": "0x52614d08f04f340a4507213886e567102b7fda15509e6d6e45c4b74fc2ef3d7f",
    "signature": "0xb3ff2337f90d37cc5b8da7ee6fe2e5d5c6127a359f352fbde4675c6f0c3c239f347c34bd7b0bdb46e8555025952be5faae419f91d6a9ac598cf6ff0799f7e7691b",
    "signer": "0xD24F8A2501472e4c9FD5dfCCDF80B550912c7FB0",
    "userId": "887242445"
  }
}