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 0x6c2c09a32c30cf966c7bcb7cd69aefdf786ddbf822895525b1fde6fbf83b4fef. 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/7c982c94-d1f6-4774-8404-9bddc8350134.json and https://artists.proofprofile.net/proofs/artist/7c982c94-d1f6-4774-8404-9bddc8350134.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 0xf4025826038cc572934b03ea14851f7e6ece6976d87d0b08f7880ff5c3c49ccf. 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/QZWFN2339433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac529e004131c422f981426cfba965a1b9d932d7e7769ae097367a13d94d4cc. 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/QZNWQ2316953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ed4b039e978a1b6f9fc1b4aaa5c5c1e0326d1a8ef2b0b2a356169ce84b155e. 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/QZHNC2341985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19effad6934088565a069a2d9a3ecb0b3c831b429f76cefcce65f15c09526bb. 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/QZHN82374128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432fd0e25e71190fe714a9e2208daf96869d8cf916cd060789ffd608201691d0. 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/QZES62335436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b37a802d6da40e2ce353274ce38e3e8f278b25a9d223b2cee0f0589b7ce6e9. 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/QZFZ32308889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16e1d19f619efa867eae5867223e19234ff0c8e3b872c62ba2a3fbb8b0cc091. 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/QZTBB2258067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84fd228917e0201d96a9bc2001bc366155bb1f67ce42ba383fbe89f73daa6ba. 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/QZTB92209387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2914a77a716a2522b6878aabafe2a26cafcc7568835e649b9f7daa67b2d5bcaf. 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/QZNWV2207485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e38f8423859fe8caafcde607ac64ff9747cb655067297c929775defe77b4fac. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZMEQ2283195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6893da19db575cbfd5d706135ed30a8ed1b1c82804d3dd79f66be5f1f95a28d5. 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/QZMEQ2290071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7bfe37296a1d00b19ee8f5edd2a5260daa31d206bf5ec3271189c76550a6dc. 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/QZMER2222352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0339fc893dfee70f6475a27d169e7ade2051ff5517ef73a624254358ec6faec. 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/QZMER2220979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6801d02ee392b3d649969ca6c582574d59067105f347a9152a909696596c7aa7. 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/QZMER2221293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65f0cf339e7af04298e8b65a88c335d30885eb9e69ac918c97213a564d39cf5. 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/QZMER2246547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2807cc7d6ef9af09dab6b3a9a20f7f0fb349db94b8640f71f4ca6a3f82235bcc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMEQ2235321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c198267f16d78083ce25ae225d384fbe3eda22e0407247e5c3620061ef8afe. 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/QZMER2246149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75afc142e80dddb885e17c419e685cce3ee990a8462e544bcae348186e3831e5. 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/QZMER2240119.