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 0xa8b9053ade2a1e5d79fa1e9ecffcd9f5ae8c16fbe4c5b429bdc4a54d192612d9. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b701497b-e3e9-4ca7-a177-61910816fb36.json and https://artists.proofprofile.net/proofs/artist/b701497b-e3e9-4ca7-a177-61910816fb36.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 0x7c77308f70dfa65745272c6f8bd8f1ac12a15873e83e4e8af74f40e4fe3f633f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZWFH2471044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ab43499e0567240cd718f28219e72ac79396a3cfc390c11f664d8bb19b2ac1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZWFH2454999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c11cc162e1bbe4f2f9fd37c78f6fe368d57317da607763f1fd37cfe64c8394. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZWFH2473406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7def5b8152e136fd7f58e51c9df20fdeb58707841495e395ca53ac44799a5d. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZWFJ2437903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772b2e4fa8e0fa826614ca177ce4ba76f0b4651f2bdca1b79a7660b9a4156829. 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/QZWFJ2440384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ad7f27c8485692adef622a93df2ff2035740da0f7f0a28412bc50aa4c1390b. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZWFJ2440387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467a98aac54ea3aa74151883bfa49036ac411a7ed6f91e385571b54fd6e47e3c. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZWFJ2442323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798d1e008a6a5e50f12db500cf77c8c5cba07cbf6f4cc7cd235b753086717341. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFM2446069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef81a44af11a4d1ff43ad8ee0e15fbe96187127eefaa97a006312f7e9e953715. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFQ2493653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f759dd557790161a5e2006e54e615dec18e6d8f15b67e9b752b699b88ed8b1b. 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/QZWFQ2493665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f090de485d2df7df63ef1d97f1708e661c0deb5b0130bb3fa54513429e3c330. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZWFT2467654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3799034c456e56157d4dde7fa875f4d5a3db9e570522fd2b1c011ab42aa527. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZWFT2467519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab19064e6fc059e2435a52429c55a79573046b244307665a8fff98b06c5a82e. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZWFT2472436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b3d00bd5df488b039716cde6fcaaf2d2ffe17dae3b4fbe3a01b12d0cd521c0. 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/QZK6H2563701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb587fdebb12dbd9afc51c38dc717d3df67f2c7724e5e25706bc766c7d68ca1. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/QZK6H2563703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb052dc07429741afd0154533b2898a426fb430b6634c42c39bc596f2b55acc71. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6H2563707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa49de19032079c146ed892d7bfa67ec906b02ebac4a4647078ee706fba9b11c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6H2563699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5d500fdf6c483484da6ba43d1ef2b113ca41674d3b06d5019ccdf4aa260b38. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6H2562352.