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 0x298566838fa9fea1f5c1bea2e21697fcdac37f40ce6daaad238e365fff04c45e. Chain 2 (Bitcoin): anchored in block 953638 (2026-06-14T13:10:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/395f6cfe-dc14-417d-b620-9415a04d19bd.json and https://artists.proofprofile.net/proofs/artist/395f6cfe-dc14-417d-b620-9415a04d19bd.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 0x8b43fc400cd12f87bda05f4644745f56fa7d946c21407c68f26ec145bbeb894f. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QZFYY2359665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed2130d1bd063d4293b6f98ef8a17c017fa00f05cbdd23d5a7316e501631b00. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZFYZ2320214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c936c30bcf61b2e951ac1afd8cccfecd8f9fb01a8a0bdaef50be86d1b62250. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYZ2368212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f56b0e07fb6eb722540c4911f94a5cd68a6bc1edf7add9c8ed5bea831c2cc40. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWR2460786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bbd1594155c602017def5a3f2efd6627779e76bfe812936f3a12f37ba92bbc. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZNWR2460788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd83f3a51cf6b628522de91558293add9e72caa6ab3dbd0de5407331372e540. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZNWR2460054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fb48f8f1bd4407e41f8192b03f9bc555a4bf2f1872f63cb5cf14f8264309b9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWR2460787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e6bfafa5535f167ca454a7a0fd2082b8c6215116195654ef7b221494e2d71b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAU2383900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106bf23a6489c6a6d570f1a7bd1c390a79e23eba992f4c06b4d3c8b742255396. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZK6G2421235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0983c7c6c22d120585162086afe7c17d9fad50ef5e537106ca3afcc1c6b93035. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWQ2498941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d7cf767f9fe1d9616d9ebe1080501fbfa63ecda10394d169171fc5476c3726. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZFYZ2511641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13d1d2ec03436b8cf65e4d19bef85ac3c8536ab4760f40719f0bd05654bdf04. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFYX2553027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe415da51d6aa1cc3b3611aaae1a34577dcd491d4897a1600bf1f011c814a330b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZFYX2569578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb966818d29d304d19304cb6a2576628e1dcb42c1bcc06b57d99def2036c937. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7U2504738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4595cf8276dd8e10256acb1156fb4135654b5250343e4b9dac93fa09aa39da. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7V2556472.