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 0x01a802176b2e697d8dbda87dcef57a1ec0cfd9f95cb068e84806f91cc93e404a. 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/3363851a-f26f-4bdf-a7ff-8929c32e26bd.json and https://artists.proofprofile.net/proofs/artist/3363851a-f26f-4bdf-a7ff-8929c32e26bd.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 0x95b4fdcfaa29fcc6e60ab0a9d4cebdc6dddcdc3f6c7713bcd91e05c4bccf1ec5. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QM6P42225778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806214ffaf032e709e9c72a17f7372f7a9f581a13482ad4cf6943e58d03baba3. 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/FXQ892200325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bfa24984054cebd6141be274cff6d7c84cfa0bfc6d4d88ce1691bc2d743fda. 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/QZTB52290541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3085dea825937928ad157c2f8b91e499e4156ecf02fa94edd5000740705e490e. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QMDA72298028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97926a25c130e9e256ac91400218ae9e5fe0d50f3a56ade681cf74601dddbba. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QMDA72298032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4145a57507b1f693dc6e2bd4849a6462f7eca42936a919d011c3e9a8d69f67d1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QMDA72298037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d85b3b932ed931680eb413781aff1e3fab68bdfcbef32b48dba467c5347c33. 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/USANG2240326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0355c64221e5416b5409335360c21b3bab08bf599b197485078e2892f8f44db. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/SE6HN2306361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cc4ba0890ffb81cdc998ae7446bb7ba7dacc4b8d7bf1fccaf3fe2c9e5b7d24. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FXQ892300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cc4ba0890ffb81cdc998ae7446bb7ba7dacc4b8d7bf1fccaf3fe2c9e5b7d24. 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/FXQ892300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a496393ffa4b4d0b1fa2d7cc420744e7860e42bea7d3c35740cf987b487754. 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/QM6P42377511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6af8d1fdf2a78c3f38614e1e894762aadd4ab21ba39a1d7ee26da13c333ad4a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM7282300858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea043da1f2318712a2e5241429bc79c87c1a159c1e5e4ad22bab5d69c24d26e. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DEZC62357663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e0a426ce42bd09059987acb776137157fcca5606f18fbf75582d7be1c67d11. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/UKZGC2500522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf8744e41d7d442520254b16514f9865ce755178adecdcacf4335e4d805751e. 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/QZPEW2469000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e8f6f0cd0f624d55431744caa7e5edb96459d0ce802eddca367df1823f6ea0. 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/TLREW2225959.