{
  "manageEntity": {
    "action": "Save",
    "entityId": "640320647",
    "entityType": "Track",
    "nonce": "0x8e511758f3ad93438c97edcce01d11eded26f172ecc85ad42047f73b63ba1ccd",
    "signature": "0x6c22be329c14c07da102b57a68357a0ca0aea803db2d8949ad6ee398d24013e00f923d6457d7002091d4e801977d68eeaa05752bc35b91b9afb6dea98b40c73a1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}