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 0x31ae5002017485f7e1d9cb52ed6b19061c46f7fec5fb8b91aaed9707302d76e9. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49bfb1a3-6921-4b81-99c7-5db11ae420e5.json and https://artists.proofprofile.net/proofs/artist/49bfb1a3-6921-4b81-99c7-5db11ae420e5.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 0x606f0b9c70250f05a092b6683f5fb52ed2f5ac1cc697a317a4d9fcdfddd559d5. 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/BCOXH2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545126bd1918548b4cdef72294ee5ae6dcfc29d0ba678e51fa9b1246cc5da38d. 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/BCOXH2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed972e3300a67fc829f5c0374a1d1d70d2c7c20d5d6c8f3b108dc1201d1a6d8c. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/BXIV82154521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feec9b056bf871c097414e7506541d8a8320a3f301f3716ef8a517d385d3755. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BCOXH2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55009de11621f795081e6a5c5c6a0734f5bec238322c6b40a6db3eea1b5e15b8. 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/BC4MX2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e6a5b02b84467b46c2702f11528af454715372254a6049f01950bc31229c6c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BCOXH2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb9b6955cca209ab8e6c7db5899bbaf8f66a72ade41022c3939e8d26a77b138. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BCOXH2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5533e61ea2388ab98df35b21796fb29a140274a0f6dfa97e2980c47c07966752. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BCOXH2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a3c623023e2deb81f9a55c657bec41a09fcf65ca38f626e2f597d05be77f8b. 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/BCVUY2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01c59fd23809d8344af05c19a5d0afd2b07f6d2daf1a61ef1724233fba7b89e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXIV82108392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf5e1215e4b27b96fb06d7cfa212d9dc4194159c9d73ea1cf75f24640a92b7c. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/BXIV82101257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcf6ee85dfa5746acdae77ebb8456335eea269cee0f47c70bf1f8f6dcae1245. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BXIV82191172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7617d31030379bac18d8d74f0c7b15fe32ab64550ddb0078c20d6f617212e9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXIV82081585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03eb04db0613272ee8d3230bf12a45734ca17ac698e53a47ed126a7cd49d03e8. 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/BXIV82028825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ceba163494579df14f492dd71a14002b1d45306e3c2775efd8afc65c37d8c81. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXIV82032282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9956b4915b08f03893249ec3eeb221bb0b10b4dda5f8407b66f6538c5c5d290c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXIV82039589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bd7caae22fd0af6de7149fed3551f0b9c6d3e32c5a233563662ce7de80beec. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/BXIV82030722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2418d9fece1d2244a201ba5703c0f365157cd4d7b6325b625dc84fd8c3b51d4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXIV82035934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f557ba323f95992590c1ec425902f83f4036433d2eab4b5dd9858411c2e69a8. 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/BXIV82016542.