{
  "manageEntity": {
    "action": "Save",
    "entityId": "455297439",
    "entityType": "Track",
    "nonce": "0xc749deb0d14112485fa6477aba2365b99fba35b2d55269c88e32c78f8766ac1e",
    "signature": "0xfc02cde4e174d492ebd808fc6110b51c9dbe59aec5aba1fb7d71fbcb7dff406863c816d58e876b3ea436b8cf0f41473a28e47a1b845965fd3048f2a17902f5d31b",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}