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 0x26e99542ce0444ecf6664ec4c9770e5b4862251fba22d3e48faa7696384b13db. Chain 2 (Bitcoin): anchored in block 953743 (2026-06-15T04:52:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3155cac-8b0d-4b58-81a8-a60af3f99ff1.json and https://artists.proofprofile.net/proofs/artist/a3155cac-8b0d-4b58-81a8-a60af3f99ff1.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 0xfd0c3368cab7d21962246c22772e566afa8c2bdfbaffa27dc09e5a1e538937a7. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/AR57C2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045ef8af2572b0da6d0dc50b95f85ac10c6dddfa08799d0e582d2aba470d6727. 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/ARD192300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e54bec342461ed6b4722a88cca30a9174dbe61478d61b82face1d4b6feb4cd. 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/ARQU92300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981c1207aa5454f863211b86d0b967cfd45b7242614cc88c76c3137299551b01. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ARD192300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a197796e7867e61774b1d29155dd8266d2fd81920b1ac684852f5e7ce45b974. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ARD192300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0557d9968e84bf16dd1c4ebfb35ca514ee667643102bd9d23b12d873ca0dfb4. 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/ARD192300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a254343f5ccb0a424909b2ddb8d95f2e4c1f98247c6c8023326d1d53a384af7. 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/ARMJY2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0e1bbecc7ad2159eef5aa5612746748756a187c2383b90c7cfb50d662ac568. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/AR57C2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a38d86f976638611ad294e751c88f2f74e034a69fbb401fb2f62ff4d21d682. 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/AR57C2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2442a6682b72f54d303eb36201f008c7944b9960875488c0fcf8aef89d88dca. 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/AR57C2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb850c9f12668afa6174e95be4140279486491c501537233deb7e205adb481ef. 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/AR57C2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe616b112d110679776bc874a137797f8e51ef352d79cfe48d12e3dc3d7919c6a. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/AR57C2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c388590bce8e0ffb3f3a87489cec36632865f545611a286136d61168c83a96. 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/AR57C2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b738761ac84eab888fc9b86525d0b33c88202036c68271aac1f5e063f3a61b3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/AR57C2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bdb7a9a4661c76c2e5e8ec4ba51031f4001674ef70a31aca3dd8903f9aad28. 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/AR57C2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4ecf326586108d588fbb925314205a1eb08790542f1e40f60c0ce5077bf67e. 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/AR57C2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa647124fa1f7c45f49ff318ea66415e6565aa2ab4136ccee613b7c18a7040030. 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/AR57C2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e55eec40773e88d7b03918a33ec3cef6183b7e67e55f5b9f07a717fc05f401. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/AR57C2300011.