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 0x0d76712741cd592e887ae257c4d7f4b4b7a6c28206f44698373ff5d565e70aa9. 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/026c19b4-cfb8-45a6-83e5-78774c6e5a8b.json and https://artists.proofprofile.net/proofs/artist/026c19b4-cfb8-45a6-83e5-78774c6e5a8b.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 0x7f903b5098e9382bfea98a327b2b22a6c5678a2c322e42b289089d2c50ff45e8. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/HUA611601659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7205a818fb921b36bd3bc9071a3db89e314edf0c3d5ebc237ab6bdc033255e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/HUA611601660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5d956479c9a9f051bff40edca78442b4337c1b3627c98c0a20bd60ed3c34c6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUA611603092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10dd0b71b9f41a3a55f828e26425f694318a4c4489f50b4675e6771681714c9. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/HUA611700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5a125363dfd942a5a377a9365f3aa625c1dec67f47222cd0dd93f0e07940ed. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUA611701193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180f5b85c552681859ecd75b002472fdbf891223ba5b1b92075c44e818033173. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/HUA611701195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223044576bef1ab4f7405f5caa5eedfc5f80ce682b4f9e6c4db1c68e605db927. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/HUA611702531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2acdd431a28b0b1d579318c08d925968172a3254e58c5ba126e3a1658f98a06. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/HUA611702533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2d11634f7162f5f2f1d709f85b62a1a003777b64a16f75bd342618285cd81b. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/HUA611800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd7a546f0c532fc4d78b5e0e5fa27b54278c1c3c5004e16e0380cef42d0bcea. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUA611900058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e058658f1dda2dc1b80b67d0e28469b896bb78e15957ceee9b0e1d0b2c8d81a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUA611902344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1083b6684af3f19626be6a7ad5833251b271da7489de3b71acd1a5c8df6f3a72. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HUA612022012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4c79f81d5efbc8feb4d2a1bbbc9d6193bf6397edfe159abc8ae3bc424d50e4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/HUA612022234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fd40c3beee8da4e139fc7d19cf47d6350fb53c2a08fed8057aa3cccf2e13b5. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/HUA612022876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9559c484fb79962723a25a5aa214997af288b1125014f98c8787114552e4b51d. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/HUA612102200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ca6b22415731fd57bd3b462184a9afc37a0ea70982c7d646022f3a51cf7fa6. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/HUA612300848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82dab753f84f19e047a82ce1b157700578af3c6dc201c7d9e1d125e5949a04f0. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/HUA612304468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e17df2cb40134f8afc56a0f2ffea7856b7c68aa6e921073aa8e48ca1ed7c963. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/HUA612403185.