{
  "manageEntity": {
    "action": "Save",
    "entityId": "980003749",
    "entityType": "Track",
    "nonce": "0xd601222eacc77d55fdf4d49fdead06a3267861bea98642fdc3405c5a825294e4",
    "signature": "0x620321305cdc77127ac0d7fb77a4db6de9dc2aab469175fac4369e74025fe2a734aec709a0e8d0bb0824051e2a0c16a1f7ab23548c3568b86c27570a014795fa1c",
    "signer": "0x669C207e15A757a751fd8f623DFf054C6D3D0b05",
    "userId": "121458"
  }
}