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 0x8ed47dbba036ee74303d0fba94dc816676521209113b8d1e5ee4444b0f5f4fce. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5032da0d-49e3-4ed9-9264-4ccea44b7300.json and https://artists.proofprofile.net/proofs/artist/5032da0d-49e3-4ed9-9264-4ccea44b7300.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 0x8048a12f8f7077797c4f519287d2f353a1ba472dfb26f81907e63743824e2553. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZQAY2521967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7fccba35b267e1c88b14a51323168e1d6491f042912fd2aa9ce70245fdd54e. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZQAY2515801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb310930ed33cb2fdceade436ca10ee82dc7751a4037f39a4189e4f8a6e7d505d. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZQAY2587368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853cd890759450172cf1316b160a8021afafb6b34490f5c52e22513e56eeb65d. 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/QZQAY2599920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a837aa867f21cc5895b1de109fec0895f34b5a806b51bafc3e7332c53e0a383. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZQAY2509422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12229dcf1c35b48c49f2fa05108c872d01d456271ea880c0c6f4f77541f22b2a. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZTLA2519590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb808c0eb72184a8d48381d266c37cc9d7345360f3aff7a87a45c5917cc156709. 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/QZS7J2507782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52fc36060ab40fc8710a6e313c173295f611028fe5c499fb42282a3264ad2d2. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZS7J2594764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298b26eea53dc020649c74a0f78eb53807e15ef9a89f0730f126aa99bf32d9a7. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZS7J2559071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809f0fb42e97aa234b92c893767726230db366d7e19d9edd9d87c7a6ebcac245. 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/QZS7J2539858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6373bef723f04c65d830a31537f347f32e3eb105d6312a4a9d35b3d4cbf9aa92. 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/QZS7J2538482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb39c9092b3a4f74e9e924e6e0f61699e1881af572b931156e3a55af5bc842ad. 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/QZS7J2537289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ad5f361893d2b468271d13906f3cf00ff30263dc70cd8f8290d6bd4ad02665. 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/QZS7J2533059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdc954ba7d4a0efc0e747c4138ffdd3491b6cbb6125f6b736e5703ec39daaad. 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/QZTLA2534501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f41a13cc694241f71cfd00718176fa9a17400581e10afc1bcb90aa3dbaef21. 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/QZTLA2526844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb8a4aed826b777c55546c8499c1e1119c9d3446fa74534f6a09f60271af15f. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZTLA2543477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbac75b612acf3ad5272b94beefcb698b31c893c178617d473c3757d30b7a7c. 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/QZTLA2530554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd512c1d95a092598ee2eea789f66a63c323f77b9dc6b04837a9503648434d829. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTLA2508584.