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 0x45b162fb646ba2da0beb5f2ea24ab9bda37ba9977b78481ffa7b908d631c3322. Chain 2 (Bitcoin): anchored in block 953970 (2026-06-16T16:09:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a08c7ff-ce7e-4f86-a728-be4c44ee5d22.json and https://artists.proofprofile.net/proofs/artist/2a08c7ff-ce7e-4f86-a728-be4c44ee5d22.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 0xa70304a95debd53b6760b68024c280c8fd20751e20ad564c3fd0fa5a447b98ea. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZTB42371423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45065d47973b211cb32b23b448bdc5b9f42f18639f6a45c85cc55d152db4986. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTB42371424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d87c67f535a878e70dd3aa8af15fd2752de31a69e3f70ca852be9135dd297c. 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/TCAGZ2360542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879046d911ddf328d8d5323059b0a35589ce81f19f7d5ce2568e44e3d36b44b7. 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/QZNWX2353518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74a3b3b25d7badc07c9f8c842aadecdc42ab5a8b4b04ba78093840d5879e07e. 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/TCAGW2324769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf337d8d375858aac72233235552aedacce4410a572ee506071361199da084e10. 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/QZTB42371425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b09ead88e2f2f3ab41791fd1c87efc4979772f5d80c8247a7811d5a52c3b0ca. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/TCAGY2329060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab21c33c1b2007eb6e5d4baa59f09fa097e0c97083269664f7f2ea9082d3c08. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTB42371426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db951857ff77b83f5d157411105e33bba42161d5fd9c4f6f420f8650d3b7ace. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCAHE2321636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2853a452d9a8eb03d366c091165ffc7c5a4799e2f1c87e2c31485c2963e327bf. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTB42371427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02e03254305ce6843f60e6ca5455a57f3e91bbf6242ba5077382e4a63d2847b. 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/QZPLR2312532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb6b03be22cea6b743bc5015c8d44cb8490e8c833e9bbbfd5b3d20cb12ab0a9. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZHN92426616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ad1c8b28ed17754c5b1d6f53876d779b21135869bf7e66a885b370143858e4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZWFE2382427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d94743b6916abf133c3f0e60a672e0533a8bab2ad508feec4962923875c265. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN62051922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb613dda4f2d02b888de973b9e286c657bf4fac3ff7f67a495678d44f54266058. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZHNB2018121.