{
  "manageEntity": {
    "action": "Save",
    "entityId": "403264847",
    "entityType": "Track",
    "nonce": "0xd7c6fe9066adbd4e58ed611a5da59ee40e6a60a576f12788211152d6a3ebf406",
    "signature": "0x0365f925af95b02fa53a0590b2324dbbf107f5f0f3f39f7bc5021fa2d01c1bd624de0a3119f2bcfbc4cc194ab7fbf338d64df0542772f894a2a77a5827cbb15a1c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}