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 0x3b7087d4a59196cc2f64305f9cb6ad7a9477db7ef656792b766ed7bfcdb8468e. 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/64dc14ad-cf07-4d16-8aac-6c2b8276c481.json and https://artists.proofprofile.net/proofs/artist/64dc14ad-cf07-4d16-8aac-6c2b8276c481.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 0x4971896b5d36ed5e419c77504ab35c903fb32befb38c327806fad2ca1c0d13e5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CA5KR1553746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f1ba49f0e3f2c91ab0cf5de00a65306caec3ce4fb0e348ac6cbf5abf87e15c. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/CA5KR1553748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b0c695322cb3c933eaaf752d78aa5541879e3c88462b6158dec93d1ce4a1dd. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/CA5KR1566053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6a6255fffddceb6b31aa54c9122192ab6db4314609555252c21d99a43e17f4. 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/CA5KR1573190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bb8835a39f54a66347a227f7aef334f719b97ff0c8a938e579ffb42171efe6. 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/CA5KR1714574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd667ba01c14bc77c281b6172b70294f852bc5b8211ab7eb949e81310a168ec4. 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/CA5KR1714577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fdbc5b5e009103c3e8cecb9069cbb5ed6b16edaa54c829d17031ed424a2523. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CA5KR1714579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9c9820b563ef707cf071c964d2bca13732d4f21dc75d981f168a2f846ba191. 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/CA5KR1714580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c0ff3456e840f5a7faa0bf8de497ea9971bfcf4596016d9b6bfd5a11dacf12. 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/CA5KR1714582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e92a475a216cd3ef26dc484f60b0d731559d412718626e4748631f81aa8e5a. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/TCADO1814997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5441c34109ff456cc8023f3f1c598fa87b107b9150943fdeffa2220eee5974e1. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/TCADO1815037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bd2ede200cd1ec3db0c4aae86968cf62c43551a21dd227c54d91051d579d75. 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/TCADO1815052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4df3c22375c65f238b4753196a6aff3c08a427092c67b53dce4edff583dbd05. 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/CA5KR2078299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd6cfd9021635ce24824f0409a138f8d8e0cddb2e4d6d2638f91d358bd860a0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CA5KR2078302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014c7e4900c5d518f1f93cf30f12c01cb0538470b643da62d5a86dd3b1ee4a3f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/CA5KR2078303.