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 0xb984b888c4e8baba235ef85213d3c986ecb7981739a88b6d4a3e61de36866abd. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a70797d9-81e1-402e-8b3f-0a0c1d6a47b4.json and https://artists.proofprofile.net/proofs/artist/a70797d9-81e1-402e-8b3f-0a0c1d6a47b4.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 0x830f606a04927c01b5a41c875a7d30549d2638c819f0dfad30e542a96ab04ba6. 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/QZGLM2410229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb850013ca09f7e23443233f47fc51074ea51e798c0903a57c36ed600058d4f0. 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/QZGLM2410230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba48d803179d28268edc376d111570f8da40568449132722e06c71a839e6b911. 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/QZGLM2410231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7a39439abacb55ed24806f572388d7c985e61f1300119a4f3248e3cc4b934b. 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/ES71G2331679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6b5b3198d872febb2fec88f67d0deb8a6e123c023e5ad377bdd0ab8653c920. 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/ES71G2331680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3528bd7b0252cba5124e9da5f00835f68088f7d3c658e2f21417d94e82a0923a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ES71G2331681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc1fc6781fb92b93e8520483d12d5556c4c6eb7b224a062cd920be39e99f654. 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/ES71G2331682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1677c62bb1e65e912be8f0fa4ac9d8600e5dac91952541f415f9e40880599a5. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/ES71G2331683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7161e5eda2bc5fe229255e2d6b13815f2805c0735743e06094436e1edb5c00. 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/ES71G2331824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f36501983fdb3f54b571f74ef8e8ec7846747798b55e72dde50366b3f2ff158. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ES71G1939971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efe60e98d1e5be4baca43e22b209450db7f3c1af9a2d8449707a18928e66739. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES71G1939975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35910f156f0d5f94573a651a731e39006e8a4fe0c29cdbbfa772799ab4996a63. 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/ES71G1939974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4535ae8c991c3c02805211dd441b378b72c938612a3057f4fc34808cfd12ed. 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/ES71G1939976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f20526ba9f6a20ab99855aecf9dfc347daa42bf1c37edf5ae055dca353de16. 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/ES71G1939977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca0e3003e182de0a4341c6cfead4882816f81d9aca2f7d68c3d194a528eabd5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES71G1939979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6005301d85f58d8c6d01da64eee29b2c3b61ff81f72756382145193fd9d865a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES71G1939980.
El Barrio de Siempre (Cumbia en la Ciudad)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7db65db0aabfb3bee8f22178ecfb5436b389da11c6ced25a27fb2ac1c3c2d37. 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/ES71G1939981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811c0a993726e701141808e565098a0273c43151984c392e5cc8bc1c1e4468a6. 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/ES71G1939978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2993166ee413ec998c7d1920238e9353c5c575f5dba52e7fd2c68bdc63aebf. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZNJW2071882.