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 0x87ac939da11c9d24990b4544e3f29c26fe5831a630584ecc1a01fa9a12a98160. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19ac0467-5851-4f9c-b472-0ee3e6a421aa.json and https://artists.proofprofile.net/proofs/artist/19ac0467-5851-4f9c-b472-0ee3e6a421aa.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 0x0df4f1ee5b643d4236bb3634cb487ee236609f383c765e037b7b08f03f5d01bc. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USLZJ2439650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf096d776484cdb2f8fba2da02402850843076e460482c9b982b95c55fdf44221. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USLZJ2466443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9038b13666b214d505bc92e0a3901911bc0d5ed243ce005e403672c0b42fb1e. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USLZJ2466450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298b343ce38ca1a205f1b48d724ea86cf9aed36dc5c025e5eed1af9b6ce766cd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USLZJ2466452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2ef240e3f6c8413359ea6cf72200e09108cc1121275b19ac354c9fa3950865. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USLZJ2466461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31a808241a6945549d411b3efaae17028d8d2c2c55d0f6f81be7a62cac0e5c9. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USLZJ2466484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2dc24c214c5fddb3d9b1627a1f47d80578659a431175a795419538374872c4. 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/USLZJ2466485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76ddfeb42ca17553a6b8bc0f05d1878bfbbd9c7c6e0884461b93f089ee79c97. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GBRKQ2436363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e416d9ba466766829c7578a53eeb2034ccc8da35976b5e1a2add63332e0b2fb. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZWV32412918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97787edd2b94b960d838dd601aa96277c2b70581c4b3a174222d0591627eb22. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZWV32412919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239c3f2911d673341638d0b83740683f495d26163d259e07eb684046ff2ba369. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZWV32412921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddffd17cd635b93c88c7ce75fcebd64feb1e09690e656ccb39d6eda4c4d4d8b. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/QZWV32412922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebec3d8b4a64eb51f03911b6b0f97e6fa8a3bfd6f0ccfd45d96136591399a0d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWV32412927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a46f5a77af83659f2577462f169d95db075e64b1d11ebeabed0659c0bafc248. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5FN2510806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef224b8abf4a68c39192ef797f72543d41403d709b5a3a209d12deb28c0bfa5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZ5FN2510921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816b186ecfaeac345a0ef8c51fd6fdcff6389d8e5011882ada75e53d1efb7b34. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZ5FN2510965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab046353648a08f6b51205058fdbffd035898667584cd0585e9e3f4d9ac0ad60. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5FN2510971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7388bb1e7ebf82ba2c0bb422b0c16876bbc821f161f6a9e5acb9a7427a28822f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5FN2510972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8852a419b5777f00f809ce2f9cd294eebbf123550e96f1fa4fac8c37f7f4bb40. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/GBRKQ2501529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947d2ab42aab028ec0ac862af00ffa2c7bbb80f6e04e91576942e8ee736ee8aa. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBRKQ2501541.