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 0xf9c96df1b690e31444b5569be48befb08be2285d394807035f44cdf8f8fe4c72. 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/33c0e2fb-929d-4e99-bd87-9bb65df971f6.json and https://artists.proofprofile.net/proofs/artist/33c0e2fb-929d-4e99-bd87-9bb65df971f6.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 0xa29fe5f34f6001c987f57041d4762ce2b59d74d02f4ba4f0775e840b8b8429c2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA52343869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11ed7a75b1aa9f691c0497ebf5c52bf8cdfed11131494d399bff9be7a44b416. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB82247688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8bb26a2ed3ef714959d9ced4029a731dfc339a837babd23846247e3c11fbbe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6M2410665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161f1e0601ffa0a50b42f7b3c758c83f2c4b87eaafa69fbba4a1e5528d92428a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN52452868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae5a0493d2060f5e68276c454e6a8223ae8b6cfad25d5b3850571cb321ac590. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:16:21Z), 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/QZES62443876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba5076e5367276363a4291c138077f558ce5a73669d59766547d93e646c8906. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES52436274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6bf190a105b410747d279c1b707fe9b690c89b50d1a8ab54454124998ad086. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZDA42436568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db4de20a83036c7bd0fd1138d17058b69c5df7a4aed874dddbc4eb8ea2273fa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFYY2460698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d54ea2ba1db84e12edc81998b41100b421d46065d8284b636a08359c2f33efb. 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/QZTAU2346017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f325dc5b9b746bca23f510056d95aeb858025ba51b5a97fa869d26b851f7070. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZS7J2358625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52b281cedf60a9173471e71f829a2aa313e4a80ae9f825435dc9afd967876c8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN92337362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9ef0e91d0888982f702b70d7f8a58e860c5e8d39417231df78b61c48837496. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN42325009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1494d22d2670e6ebcf1ee355e8852eef27a18fa528cd434ed1010af36b440d7b. 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/QZK6K2288052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f325dc5b9b746bca23f510056d95aeb858025ba51b5a97fa869d26b851f7070. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZS7J2358625.