{
  "manageEntity": {
    "action": "Save",
    "entityId": "1821707839",
    "entityType": "Track",
    "nonce": "0xe0585939503365464bc8cd235e02224b92840dd2bdbcd9179c5e75513072df16",
    "signature": "0xbd7ccbf1b983f67fcc6e357e02ddc068854934a269b89f7d7d3ed1cc7bcb609376db1f20947412f1a9b346d38b3c7d58918b263f06a8667a24ac805eac9084e91b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}