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 0x435eab0628288dfb6a0acad8ca96b6dae5ba3d43027683a51a14ff9d01690161. 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/2b0ecaaf-9c5a-469d-9da4-baa8faa23063.json and https://artists.proofprofile.net/proofs/artist/2b0ecaaf-9c5a-469d-9da4-baa8faa23063.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 0xd6a21ad8321e08b691639708f10ab1232ca7f3b2760a0d396a14b34d5b301dee. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/TCACF1547959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774acdb9ba18aa29164fac9b0102bccda19f0c1abfc16e8c88cba7ccf1ef3ddb. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCACF1547960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c95b7622a818194daea4e0e4ce5bf63b60b2129684fdba3ec77238fca329e46. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/TCACF1547962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fdd26172ae50821ffbed1400e583eb2a5d14b707fdf100c37ff064d19b250b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCACF1547965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd89335937ce373fae1e271dd3460eedab3279afc97b8bd752a10ad208151a1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCACF1547967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f45a2d912db5a772b7272f9a4ee79bcef3448378c56fdba0556f5b8710dc5b. 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/TCACF1547968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03012a2dbda127720f20fe84f8973b0eee3776256603d6bac324cb5dcd60d327. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCACF1547969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe92e0a5a98a18f65793f658e570086845c9c2aa2fdf54977cdcd181c6a96a4. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCACF1547972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa5198e229671222c4702de1570e59299454db7b789c18c01aab3ed3a4b8193. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCACF1547973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cbdbaf6c6bb5d0f1466a989e855f68af85ff04d6b89cc7cbea4ad022f1d3fc. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCACF1547976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f57a433bdeef8b4463ca6526463c34b108705295cbed10157fee6906bf6e607. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCACF1547979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e15232cefedfc966289169ab63f69a30fa8b5911db20a9c1cf652759fcf1235. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCACF1547911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54dff5866e1237891b35f1d5ada5e120081d7d487844f9f57d8a7c8d8b8dc02. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCACF1547918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6f319bd9c37bacd83fea555d63d811e18580ba4b88e9199c8e6f0afb3ed900. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCACF1547920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ac3e72c7a69bcfdd7e0ab364780881236895f0fed03b5f426d9ddcd34bb7e0. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCACF1547922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f07fa99e36c54021417956c7395f7580dcbabf91ca1a9bba602aba3daa40c8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCACF1547925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6499b5bea5d0d69dc2b31a63bb46699924a58d609dd75744939ae73d6d312d85. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/TCACF1547926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fac2e46ed68f0e346938223410de2eebfa6bbd782ca5a4b72bff337042544a2. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/TCACF1547929.