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 0x638d8ecf7639d447d822ae510fba943d643807018f5a6402280f9c4d3d787a94. 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/0e5d812d-3c1e-4e2d-8b74-a5d46be21551.json and https://artists.proofprofile.net/proofs/artist/0e5d812d-3c1e-4e2d-8b74-a5d46be21551.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 0x45ea34b4cb06ccd4484161b0d9ee6698911f11f39b61f00eff053ac1c4e88d39. 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/US7VG2425724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb745cdb4ce96c7b1136488d867fa3e88fe5f5c26f63d2189c641080a65116ece. 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/QZ5AB2470213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23e3a51a85bc54b4d615cc9b98954d3d92b56a49cd9f4ff9693ca1ded0756f1. 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/QZGLS2396066.
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 0xb745cdb4ce96c7b1136488d867fa3e88fe5f5c26f63d2189c641080a65116ece. 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/QZ5AB2470213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ea34b4cb06ccd4484161b0d9ee6698911f11f39b61f00eff053ac1c4e88d39. 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/US7VG2425724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23e3a51a85bc54b4d615cc9b98954d3d92b56a49cd9f4ff9693ca1ded0756f1. 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/QZGLS2396066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe357fdae308e8941540c94590ff0c8ff1a66329739a64703a7298e403bf5137c. 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/ES71G2304478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacf5c89c6eaec0374d2dc76a205711313d95230c33c42b1e462665a1c5294b9. 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/ES71G2304480.
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 0xf8da3bfc72d92067e48971955237414cd46ad7fbb091aec6d547445bc30c266e. 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/QZW9L2489546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064e1aefc34efe94d9e708d909f3aa0ebb189891c54637271b1da8816c88c8ce. 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/QZMZ92515333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb7e77be377996eeb3d376dbe8f8cf0ec4a34cdf7f784df17f01256b1ea8002. 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/SE5BU2572192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7fc9d187026178b518b14daff77d51140e1b2f51919c23a100dd8e0e79e61f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:56:21Z), 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/US7VG2553692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b161806820ed477d8e63499321085285593fde2fc6a2234bffcd845aad6ee6. 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/ES71G2109991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18b26b18f3fd8e53a9340a5c25d2749537c39d137e90e0509fa6e653cd641c4. 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/ES71G2139300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c5e8c7b6c098a75333d2baa9b3da11479211be024e17c755ec3c536e51e527. 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/ES71G2034992.