{
  "manageEntity": {
    "action": "Save",
    "entityId": "395573476",
    "entityType": "Track",
    "nonce": "0x94c68a560d064f92fe54cc5fb72012c10306f948d34cffeb705655acbaf7e07a",
    "signature": "0xc9e1644ed3fa838ec9c561a742b32f632929d6148d8b0e0956c0bdbd6f420d78021d44853aec1593ac52bf4c3909936ae9b1e72f6b53bcae99c4b8ad08c68b6f1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}