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 0x9ac1fe1d49dab2d5e5d57916b6c9d8665624c2268c58a7f2ada50f29bd45557f. 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/7139c36a-74c3-48fa-a50e-750b48f8743d.json and https://artists.proofprofile.net/proofs/artist/7139c36a-74c3-48fa-a50e-750b48f8743d.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 0x2275b78dc9fda2a698ab68e6fdce1b51c8c16011de14118cbbe180a1e6bc3c75. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ATEK02277235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e7f55c35488ca2ebadbbbf9774030eb5bc0a12dbb7f48be060d46a33df7b57. 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/GBKQU2262345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f50b987bb70a2fe9399bf75fdff04563040c5faf3c6eb46058fa051823c59f. 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/ATEK02277350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2969afe88b19a66c6147a04b976db67f5010f7e182fed9f47e685a948eb73f. 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/GX89G2355378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3466323ef0c30385917b171921455d121d8d919bda68f011c876f8b5e5c74d10. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GX89G2339574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a50f7e94cb778994d018a36f8b55d18f04d3f7e4e7f618fa3405cad218b25d7. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZFZ42374519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba64d392d5ffd7a68610142fa09194e0d0ed4000e717e92975dd9e075b45129. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DEPI82320483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9e2626c56f26f654f01842a4f7ce508cdebe50374765eaa8475c347283dc6e. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZWFN2381327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf247dd229b47b8784ed2c23366d24fddb75530db94369432fe184bc54c0ce3ef. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZWFL2340676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d49066285638410b037b4557c68d124bc80d374e60abbd1709216681b658157. 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/QZHN62456073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be449df7265cce56ac2b3aace9b928ba20f91fcec36fb536509f468e169cfda. 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/QZPLS2401108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9097ad2d2db07f028065d2d50e50dd5499709dde407b2ecdfdc4dee932b136cb. 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/QZPLS2401210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcd0149c728ba9055a3c4bb69a8ea64de0506145239207363f22cd6d55816e4. 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/QZES52550282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9c55bb5458251765baceec42d12d41f258efb2da7ef0c8380ce1aaee4ef3c6. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZHNA2572178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ca4a12e2cc27cadb94bdc6eb59a8a9e30e0d6aaebda7d4b1e87a339eb5b33d. 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/ATEK02177122.