Humbaba (Ḫumbaba; , Ḫumbāba, with an optional determinative ), originally known as Ḫuwawa in Sumerian (, Ḫuwāwa), was a figure in Mesopotamian mythology. The origin and meaning of his name are unknown
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727705e89b449cc99d33fcbe5aa38d3a65e29dbf7fda6a349df5fd3321e2ebe3. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf2fb1bb-1e93-4200-b6e7-b072b48b94ec.json and https://artists.proofprofile.net/proofs/artist/cf2fb1bb-1e93-4200-b6e7-b072b48b94ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ba38994d4628038239dce139b65e3445bb7737a3d52ac66876ed2f54a3a7f6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac593e1f23b3d4fd94e42ba4a4a574d3cc74987206e6383d0a96aee403c1c501. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f252168b31cd05f83c16a100ad95fa90b505e2c9b2d558be6059dd4cb6d08a0. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:39:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3116dacde33d7c6eabce990cf6404995d4b6998e8314763ac55c1e79c51f59e3. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T23:47:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c7b60b2801974d2fd8f25ca6ec4ff296b4e4b016a15a27a12ac9a56f41ac9c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T23:06:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020534684dd546394c7f576b0064b63cdaf882d3a3fd4e10d7dbb909749c6349. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:25:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34368bd8ba1a18298b9a896ccbec7b1e9a74102f4f47d0c74fc3833d6e70570c. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUXN22222398.