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 0xc7c96b23627a59c0f36fbbda7585b2dc93f9fff649a06e293f2539974af81fff. 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/f3c26fe2-bff2-43d2-b402-2e5ca754cdfc.json and https://artists.proofprofile.net/proofs/artist/f3c26fe2-bff2-43d2-b402-2e5ca754cdfc.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 0x7b3cff04adf3ce0dd26cfb714494e67fbdfd7dbe48d5fa599eb1fe7bef228735. 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/DEUM72403055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2b99ea7f2382bab4b81792e3f554f74d50260ae432264692332184706d2c98. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/DEUM72307744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604b1cb70ec96619ef15914ef83cecb399138925fccb7a3cfae42f86343a5edd. 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/FRX872025515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ef36791e0576dae337173f9717af0948b0ebcc6f1ff631d5d2d76f621690b3. 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/FRX872025516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f5e8db46b123d6d9a51b0838621ebd16ae7c9e48b4f990ee81cccbc6ea6e80. 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/FRX872025517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917e61bdb02e06064c5a741d367a28453b2b06724cc9bb36a7847a55828be990. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLQ8D2101498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39dd121ee2314de648ccfaae7a9e4a0e2f15952fb393110490402f00e213e536. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLQ8D2200812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba012fbb93440df2f09f3d00969c94054bba0a7f2100a7eb435bf480c898e0a. 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/NLZ542301166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4eb8c6d1b6289fc36f0130cfeeb95a3473bf34b7481c77a23c14e4eb7b403c. 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/NLQ8D2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa59004b28c8d71d9178929a877c0b6d53e57725ee2d42c2c986d8e091f3c7f7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLZ542301167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b31df51d9786af61ca5110cfabf8a4c51f2f828e48a479520879f8d917d32da. 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/DEUM72403057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3cff04adf3ce0dd26cfb714494e67fbdfd7dbe48d5fa599eb1fe7bef228735. 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/DEUM72403055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2b99ea7f2382bab4b81792e3f554f74d50260ae432264692332184706d2c98. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEUM72307744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb95435c662992a0ce4175e5eea8255ce2a62d0867c5106115b50ce0c0d701. 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/NLQ8D2101299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a2afb3b152b072e3b79f566a2307cbf6127f031bab120e315d5aababa6811b. 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/NLQ8D2102266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205f08af621f24c0b8e6d35653a220639b1eca291ec704870532e46e9780adca. 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/NLQ8D2200970.