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 0x1d74dcec0f3b0068b7179fc51f2ff3d0312cad81f83e59e64d3057cb3c18ee31. 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/2ae8294f-7db1-4e3a-b2f2-d2b61fb8258a.json and https://artists.proofprofile.net/proofs/artist/2ae8294f-7db1-4e3a-b2f2-d2b61fb8258a.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 0x66b2cb0e7effe5166ffcd5e91f924c19e75ff977b41666a17929da231fc05849. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BC32K2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb0bcc8d85fac14afcd83be5dbf117d298443d203d31a71896f82432dd0ba07. 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/BXKG22401293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef57e0f9f932e8f4afaa08d7279515f9338a9af8784d5f88b9ceaf74f3e46cbd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRWMB2302318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6db207771982a96df688563193379e52b3ae6677f3660993e7009851998d677. 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/BX7P32300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefdba8ff6f9dcbbd6e47a04d8edfab10c5356e26689ec3fa9ffe9bf52334bdc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRUM72400338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af3113f927445faa418666edfef2c63fed761b4b6067157d1d44e81c10a50b3. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/BC6P42300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d39ee2d5aef2f826406d309c853ff571b9948fa85d25dd120ed27fbfbb1631e. 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/DEH742307703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1126c698b961332927906f69ac9bf5269ae0b60eb9a62fc3e01d50bf834ba6. 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/BX7P32200210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d836fc49baf41317de9006c7531483d8c4a9ea48af2e24cc288851d0b2f1d3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BCBKT2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf025c331aaaf5d87386bb95e4162b798a5003ccd5c20ab6ebcd65d0929d68c39. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRRGE2400886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0b06416dfa1146d1c2a70049a9318699cd385717c13951d383aa42a622e44b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BK4442400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef57e0f9f932e8f4afaa08d7279515f9338a9af8784d5f88b9ceaf74f3e46cbd. 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/BRWMB2302318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1421559fb4709f12cf3313e189961223f1104acbfeef4b76495160c8dfab788. 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/BCJRA2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419f4c25518795f665d7a0ed285bfc0782f92e55e6cb27c2c8efc0d814fd158b. 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/BC32K2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef57e0f9f932e8f4afaa08d7279515f9338a9af8784d5f88b9ceaf74f3e46cbd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRWMB2302318.