thumb|Unidentified men wait at the gallows before execution of Melquiades Chapa and Jose Buenrostro on May 19, 1916, in Brownsville, Texas. thumb|right|A hangman positions the noose around the neck of
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 0x54131f2cec8034e878afa0f61dd09f2685d023a9760b65ad10876c53e483102a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/98ff8eab-eccc-4f0d-b1b2-de6679cd1036.json and https://artists.proofprofile.net/proofs/artist/98ff8eab-eccc-4f0d-b1b2-de6679cd1036.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 0xcef2b5da86ce8c7e01f666835eae2ddf802403008d4bfa2383a8c0ae216dee0c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBAHT0900081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152374bf6998d221685283299fe5ff00e87f977a545c212ba2509f4aaead986a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBAHT0900082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b21a8a16a3e6fc461e7b52d9240bcac58917cb75b4fabf81fa125ee1438926. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAHT0900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d4116dc9e95ba3116a6d8a077227ebae2652e508b79de69ee51b783e81b6a4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAHT0900084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989f58b7a2d1c9ce87c240b8ce668c2f36f46ade3cddf04e1b6306ff50019058. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBAHT0900085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac533b7ecfe79903c1c6e76b711b6eb60a83482d1a6d12b0f0a3fff081d38720. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAHT0900086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8239638261457a46a09d6e5637119abeaafa74ff1bf11353c1937eb5ae361a75. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAHT0900087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e5c01148f02480418b3606d8ed2ba7412c2142e875b93a09505a2b96fee955. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAHT0900088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8077e9978d90f59f7c7309bebcfd069b300aa0a264481a2ead6d44f4270ba583. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBAHT0900089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427da74d0e6d8fd8bb8429d1b668581b5b7b0fa07fb4be8b78d0ec2a63215744. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAHT0900090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fcc579ac22d5e5d7e3da7890a0695acf2a0c5818726239e33ecb5cf37b5945. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBAHT0900091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bec16f5823749f6cdd9d05d748a2cf7378b887fcb60effd33f1bba5537abb5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBAHT0900092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6fda3629b13751aa9c2249b62eaa31c7c058077b06a93dc3c5da12553b6f49. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAHT0900093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbdac1f8bdb377fd3f6c98c33fbe13055ed10cec1fc2d86df26684ab4eafbfc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBAHT0700214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bac84c59d1779b2887bac347843fff1d21fb520e424120d9dd464a29cd8f0b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CAL451791506.