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 0x2020c147f88f4da0e1e6565133b845f7594450ac2a83781b9698f6a9fcd39b4b. 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/208c3371-57d3-4fe1-bdec-5e05517916f5.json and https://artists.proofprofile.net/proofs/artist/208c3371-57d3-4fe1-bdec-5e05517916f5.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 0x7b5c3a2c7dfad77fcb8279463519b77b9b8858c68d432d5b0463b0872fbdb17a. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/GBLFP2069793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9745956465a513a60e260471cc3c5f62ab7fd7deb4a11721ebe2729be6a2ea1e. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/FR9DZ1902476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5c3a2c7dfad77fcb8279463519b77b9b8858c68d432d5b0463b0872fbdb17a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GBLFP2069793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6aded7b932fb83186ee4a8e9e8a0c76beb817c9c506a2e55311384b1e3eddd. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/ZA41S2200129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904b2ba0925a04a875b8863c27b1ae618cd4efa5c2d73b96355ee192c97ff4a5. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/ZA41S2200134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce21a76f61e0c344b2a138b858251f2e60e1a08a8c323fe262ec5028e52fbf69. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZGLM2376583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0464eb90be0bd1dfe00c7ce922f80ca9b10882217807da883bc926fc6b52d21. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZ5AB2436229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddc5e56379fab92336e74adf437bd432037c527d9f0981718639b5c61c27224. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZNJZ2449843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd56492dcb47cdb050537bb682f73cae408003d96770ca5b84fcabd7af310a8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZGLS2574864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83945d7d0217e0099bfc5342ce01d3761c08a941b38361c18a0e70404cf68a2. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZMZ92559512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc83abd13f76e61b3d4aa36347dc2b12ce9fee9700c849d16347aa4f1673f2f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNJV2588082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5382957be9bd8c714e963cd584e48afd2b429bf691da5c87014389a3a9e8b653. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHZ32157488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed6345000b40c2decb1477ca73cdb7669c88f694091cda658915deb14eb9659. 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/QZ2GW2200234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb671ee977718deeeea0c1bae1ef396f05164a0bcb9b6632cd35e9d2e194ccd2a. 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/QZNJW2035060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93010c0a51aa31295d1f2d5b43bf12b5d35bcbe7ed939e74ced5b5482d9fafe7. 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/QZHN82191328.