{
  "manageEntity": {
    "action": "Save",
    "entityId": "149207506",
    "entityType": "Track",
    "nonce": "0x55bc18bcc20a09c1e0bf5f9152f8873d2336f0b199a7bbbb73a46b9417d48f50",
    "signature": "0xc6d2d3d468fcaf86179a6da5b9f970ad1b92bff4dbf1a8201d9124666e052c5f66db4d58d8a7466d2af698fcdc5662d724e6bff12998a299f6c71b056df6b0361b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}