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 0x4ef151a2f4dce035a1a60477ec41581d6aead3d7ba5724ceaba9ebdb83d87f73. 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/8cf3e8f8-a9c8-4bc4-9c2f-97e45fab0737.json and https://artists.proofprofile.net/proofs/artist/8cf3e8f8-a9c8-4bc4-9c2f-97e45fab0737.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 0x3ac804289ae10145211bdd29bd2d5a78f1325aa648a795b86b7120e8515e77a0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USHM81982950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc2d0d5894df7e0a41cddd109e3559a180cc80d1c1a149d2c3d483ba3a554fe. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM91941373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda325ad1bcc2c28239eca623a69fea10c36c32c4597344705286b5c72e95e18. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/USCGJ2019450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a0dc07b74f36ce5361d7a3612d3e5cf4ac479699f863400b5dbee5e403f4e3. 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/USDY42065877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42983f16acbcc931f32bdd741979164214c0cb668a4d85d3703ce718bebda4a3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM22053908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe717037a63d755d29a60f51cf4383df62b0a6c455a241f3725829cbd81ed84c0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USHM82008758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0553ff71657172af162ecc611e2e519015c2ac1ecf78b9aca01ef3e98efed207. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USL4R2064583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5f125941c696a96804721c0b1b635c5c8a929a709bdd96f93a734382c8d0dd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHM22116343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8881c094b036066ec5f1bae87e7e7fe80be722f71347ea3e29dec8c271c436f0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USCGH2228209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adf6def493cebf654850eb0ce43d1a8cf8751f2e53d5ff3ac65f3c040279443. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USDY42217015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf2e71e934bc6687e593584ffb21c52b771416dae4e802a0320017a80a50bf1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USHM92240369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf51b3f16a6d9f738c66c5bf1452694dbf9f5cee2b4ca50e7e6fe1dc5e8f4f5d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USL4Q2289395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d63b8010f0731994659437747ba01180f38ff610ac92e53ebc1aabe06da9eec. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USCGH2331531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed20f9e9ab954fcef38a4ad72eeee1f2aabb5287815e14c72dc51eeca79c97f. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/USCGJ2353442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421f2f3ed2bdccb672f916b128fe6fc54b56606047467c720d42b5b5e6374635. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM82352953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d266b8b2586581d40b8bfc5ce6a79092025572d96a52a5fd45d53715daf0875. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USX9P2321051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884fe4417a20e7aede9ece127b8ba13461e1f99d98c04774c7f4147f1c33d959. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/USHM22574990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b882dd088e272fa7128d218f9fbcfff73beb289eda3802840002768f083ad7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM22574991.