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 0xc1cc8e73e0be2f9f95d43a34c4e9c65d9126578b6be4a298579020d396c9905c. 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/02bb3066-1391-4898-9cce-c1db2c0a0a2a.json and https://artists.proofprofile.net/proofs/artist/02bb3066-1391-4898-9cce-c1db2c0a0a2a.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 0x3047de273156f5860da2ba96e1eef2bd89bbf2aaa11541bd4ba5e2b91dde4fe7. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZMZ92377142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad2277469e925e3d5ba0334d1dee320d1f40f574d79b8395e31fc96ee051e5b. 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/ARDJG2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a50c80c3f469f340cb5678f7a9e1f265a67eab4813a821fbc77811183422b4. 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/ARY4P2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83cf15a91b55c0f911fc9bda2bc9e7d822b2dad6bd9da4812b465ad8b541069d. 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/ARY4P2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18beda18ba6e049eb8572421484d93834c97c4d8bd00bcf5392244b835b66ea8. 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/ARY4P2400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccd3505c6533f6d32dc731c67cb9ae7b0e54c135e631edca5a46c8ae1313236. 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/ARSPO2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd75e55036daf42736c4b9cf6c7b6b887713b70543de4edb6cdb88d1c354767. 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/QZW9L2302043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47958c294ec3496f8b3b2e1d37090e44d698b2398bcab8a550636869b534f7ca. 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/QZNJX2333594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7048d25d58687a5e408e01586b91cd73f36073595af4053f70c48a9e11f8f1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ARF7Q2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf623138645efd90e60bab04f7d2c819fe0e9ab578e594dda11ad0bcaeacba1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ARGO92100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff3836f625916b175f4d139904063fb87a251ce4f9ed4497ddf33448e41a5b8. 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/ARGO92000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5a9a0c9aeec1445860d01ab360f5938a2bde6f77ea6806c9f3f5d642a1f365. 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/ARGO92100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89b9fbbb4edbef0bb51458c7666424d9ec571b20eee49890b3b79182d82357c. 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/ARGO92100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a65fee6dff18185b6fd2c4f27c82e1df4d51dab893bb9707263ffe5d041d643. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ARGO92100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e05b119bd3b61d34215c788b0f9edc71ed6553c75bc724a511c749ccc1bbca. 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/ARGO92100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd986f4b88e3362205581a9b34cabafe6fae5605f347e2630f48db56d11f8ee52. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ARGO92100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a98dcfe86df3de397204e1d836492ee22c739346db4215e9dcef4cfbf8ef31. 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/ARY4P2400333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477540b3593787667f5c07e1d78c20b64ad6649346b6f5f06ba26668caae6ad6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBMA22323622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86f9bb68ea7cf711c85c31973faab5b12cf9505f80bee402345ce14766f0c91. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKXN22163179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff3836f625916b175f4d139904063fb87a251ce4f9ed4497ddf33448e41a5b8. 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/ARGO92000042.