{
  "manageEntity": {
    "action": "Save",
    "entityId": "658826872",
    "entityType": "Track",
    "nonce": "0x76c30193774c2b0172d858476afc9614f073b8f965d42e5f3862448b8186ce06",
    "signature": "0xccc0ba588ea7c138e7e08734149f45f69e69a8de227f9ff9109c1e6f955b9f217cf26e16e8b26a1c06bd0d03d67f84393832e34411e0259112c0b1942c2b37651b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}