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 0xb744d58df72153971593c6c15f554b9a5a7e60ea79f811ddf29c50fe9a90d20a. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e29456d3-6d81-4fd1-884a-3eb5619c1d31.json and https://artists.proofprofile.net/proofs/artist/e29456d3-6d81-4fd1-884a-3eb5619c1d31.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 0x5a19020b4fa42275c216acd1b5da9267e7238ada4521de1fd6b952e196ae796e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHNC2101344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879f3ffb826c6ecd0ec731232f3d46f635ae7bca9eb66f98464f81aeabff96d9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAZ2298914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ca994c036a6708cf77ff5373c3ecd0d465c66c0ee2443ef50465bb4964b644. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTBE2367373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44aadf2114b6389c6002b0a280b0f5c9a62dfa4844b815beeba262e1ac47148. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTBE2370276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0f5370ea1edf17dbbb3792e2708cb39184cc9e4a42f1068527ca2ace0bc096. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZTBE2370277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c3abd98833649387e46b1d2a727491042f23a96c454c6cd6907510f597b6b8. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZDA72459977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62de95c7636faa2ecb9407a8df76d46f2325cc8231f3146602239992d4849f3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN62473074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8c90510f8e0e5c1f7219efd94f10d2bfd22a26c2f481528fbb1e92d9444861. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZRP52464709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490da67e2c3534ba0f51d26bacb2e5c9671d0d33aa5421f0d157c859f24ab4e2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZRP52464711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86d22e184191bf79e487774758af61c0602c9325f94b1990a13b6ee0264bd7b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZFZ22559307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65c4938611999be259cf7c953b0a4f71bea84db82e548d49c19993523da874f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZK6N2596442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8ff4f4b21fdb0c7205e81c63751b3de78823cfa29b54b1f88ff3c65bd866cd. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZK6N2596443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8077254a860863e7566a9ce912cf43f8550390af8d0dcd4a50abf5e3db97ee. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6N2596445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be2831706e1725b17294d84b6902ddf6e45b3033cec824b2b644d780dc12067. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6N2596446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19aec40bfe46fd75858cfc5413e172192a59867f64d21b52766cdaef2624a409. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZPLR2503524.