thumb|Retailer & manufacturer's distinction of axe and hatchet thumb|Hatchet thumb|250px|right|A hand axe (note the lack of a hammer head) A hatchet (from the Old French , a diminutive form of hache,
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 0xe72d378b796a2c05f5e78dcb8d70514b51020548e72cf34b2bdb3dde26590df7. 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/ceabf2ac-5cc8-43b6-8067-9c0f1d6f7f25.json and https://artists.proofprofile.net/proofs/artist/ceabf2ac-5cc8-43b6-8067-9c0f1d6f7f25.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 0x826d02ec2aa12cb77648f549c70b52590ce67410fc571ec861043608a5fc470c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US2421330601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa94d7315da49ab262ba31ce6b39a87ee539e1f61cd8e20e4f678cc8941e1c62. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US2421330603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb53cfc9e6bf5640a9634762eb8f12bd31a8ea9eaa15922871e3fff181cfccc1. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US2421330604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50548a9f189e702966f2e46b01a2910542713c9677d4296c6dccc629ff20398f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/US2421330606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfabd315e173556790f9b2830ca7bf1e84db907b4c73df695b87872e080f31f. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/US2421330607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a4b16756547a2f3f92f4f22503d104769637f14b5839d58506413d39ccd26c. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/US2421570302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428b09e8b8155e54923fa95e1f2101dc9fed94603aae527b50cfbe81165bd87a. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QMJFD1805102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf24c9f6a39920b30188fd55f35f8482099c4070eccbc43beeec49bf12e00e3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ8DB1700569.