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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ebd440dd7b5d3e6a5bfa0be7da25e76e5ffcf848e31b03b606e7e3da335df9. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6997c236-ef1e-4f00-be33-9ac842048100.json and https://artists.proofprofile.net/proofs/artist/6997c236-ef1e-4f00-be33-9ac842048100.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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71aaea53d7e0227590e7afda1febe684bb95511514f92e01177ab491c3a40977. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USHM91711702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c4448665ecbc522bbe979e341d2f851ea922d57f8a5d4aacfc0b1a41afd854. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USCGH1808297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192fdb52f1b2e1659cb07c6f80b9253a38de1b88d80be6d4a4e373686f3b20b0. 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/USHM91888900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad60ea8f8409971d8367c5e5bc19c9ff6b74c553b860d878cb6c842b12382de0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGH2018410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a836533c46681e814a5fd6110ebb31139a81e6eed20636ae2b11b8051400cc. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN92007151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2a05e4a2b27bee3dab76646f509d5f142d3d26fd0bc8f6d93e9e477f20a1e6. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZHN92036073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3371f69dff0c8b3218d72bd0b15134b0dc2c3391bd5ab18f93f2dca54de2679d. 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/NL4WT2000135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d84a5da1ec2eecd6431a10fbf7a26a2477f7bb73b5cf43a48199b2f4ee70e4. 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/NL4WT2000136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffe07c690a3901c3e13f418d2dff2606458e80da6f6d07dd95aa09e15adabce. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USHM92168446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad61eb9219c12d0e4682b87a27435b5d99474d3b4afd9cec01678165c1d6b5fd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NL4WT2000247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da00163ce7d8b800bd581172950e47def7111a9bedee4166e7092f1669992b8. 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/UKR6V2012698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafb55b8d01fc59b14956fa3c969ae536556aa5ff4c21e0c8e30ee6106921fb5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/UKR6V2012513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf596dbae1cc3e7e86d84192f2295aa1e9d1c4e7c61f9a5bd7ef09cf5461e58a5. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAHW2407557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c3ddd8c35a7ba36c4edc1eec9a7e771239ec33897b5f9c53b8160bbe433158. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NL4WT2000029.