{
  "manageEntity": {
    "action": "Save",
    "entityId": "329427",
    "entityType": "Track",
    "nonce": "0x4eaf8bd86d9c85bb88efeeb40fbb701d6384ff8d72f56bd9479eaafeeb30109d",
    "signature": "0xf6c72106f2ac1055cd2d1388a30096754160e5cbf4f291ebf77873706c74cd1f081ebfebcbd559ed5eb639519db68ad86459fb2bfd40b9f168f419986e2247381b",
    "signer": "0x7848c1438a663A70aF2A2B1e61f7A9229dcc818e",
    "userId": "490080902"
  }
}