{
  "manageEntity": {
    "action": "Save",
    "entityId": "2112117897",
    "entityType": "Track",
    "nonce": "0x3d49edc48e2e51caa665a0298a683058bd02c439b4d6e58a342cfd946ad64ac4",
    "signature": "0xd8c3845ebab8ef31e4026eeacd12f26585392a16b61cf6b54db87a8500b70f331ef90a3e5671979de18cc68906ca6cdc727190c084fd00a5c33980f9808b3b521b",
    "signer": "0x66C0920dcA0b918ab7d0c1A5d2251fa05C75EBBC",
    "userId": "1931557"
  }
}