{
  "manageEntity": {
    "action": "Save",
    "entityId": "252567",
    "entityType": "Track",
    "nonce": "0xaea8f6f4b13df71f69109b52e29eefca44287bb9bc218118322bb2af94e0959e",
    "signature": "0xd678cd3c78337a3b9bf22c119f321c1e3df17c7eb3b45fb5fe67885e820d9bca5c9491f6bcd8c6ccf9485bae39117878845e808cfeb5dcf1f1961cfacebda9ea1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}