{
  "manageEntity": {
    "action": "Save",
    "entityId": "1531211455",
    "entityType": "Track",
    "nonce": "0xc65cffe435ba7373e4622782ad9896b6e727c6413d2892c1f0a54c147adcd8ba",
    "signature": "0xcea0c947bf573a9f0ef2d675964ec356e614fbb9210608a800dfecdce3bb4b547101f77726f50cf04488592b4af759fbac207fab7c5fd3744da2160b98a1a16c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}