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 0x0b55c1ac184d078132d6d4a08e5ac66fac0bd5c4918d989eb5d1b1fbd3e56e3c. 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/b8f5c6fd-29f8-43de-8fea-57334e449e17.json and https://artists.proofprofile.net/proofs/artist/b8f5c6fd-29f8-43de-8fea-57334e449e17.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 0xf475fa7dd5f1d6ac19d7fd19f78731f0afb4c5eaa9ddf5e4f1406f4ab0728284. 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/QZHN42185349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908c40af634d2483475f6e43ce5d66e0fb40b620163ff11c41317f610b104ec0. 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/QZHN42185350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fafe8e699a5e44f460e7ffe73c165af286b114bd6b113ef50c8c61c8c986209. 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/QZHN42185351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f37cb1fd1a85730e233ed37db3e2fff916a104dfe91d2ea4565969d84ab436. 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/QZHN42185352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f809896b19c1a2b522f752c682c898693aad7cee5586d30efe691c0fc6e3bf0. 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/QZHN42185353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50385cf9399642b9f4e704bfe9c461c2cf510fd04b5cfc3ad015ebedf0842c0. 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/QZHN42185354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9957f854fdddc5b85808a6677d4576844b7e62105eaa02a554684f314757c8de. 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/QZHN42185355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec999c5b3db3f5f5a3a097d1c4b4e6d4110b94ee4f5a2f178f146bfb63e2b92. 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/QZHN42185356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf6ef759ab2d879ac85d9cbdb02d0ac4aad39755390e0d55e783e7a064771ce. 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/QZHN42185357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40e82939e8da2b2a2f69e006cf800fad23e30570b8233681f24d2a34a7b9475. 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/QZHN42185358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70310bc76f9b17da9183148128565686835b49a5760c52c9b037dbb61f352260. 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/QZHN42185359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82a8de586a123463137a0d8fa28ee4166679709c80b0c5244b605f5d2b65ecd. 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/QZHN42185360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x480bc496e196f43592bfb29b5c19f12fcfbf9b12751fea6f5065cce00378ed24. 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/QZHN42185361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34dd60a3c0798ae195a4cf66fa8c9a7aee3639b21fb7fb8bb7115aa33d7b31c. 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/QZMEN2110400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27c8fe28cd99aa78ad4bf7d59e9a4a2349d5db3697519f9790d9bb22da6e61b. 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/QZK6J2136794.