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 0x65eb00c1a390c972e925428436248987792fa29367506caf2e463557d709a3f4. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21d1b74c-dbd8-48bc-9375-de90998a9f79.json and https://artists.proofprofile.net/proofs/artist/21d1b74c-dbd8-48bc-9375-de90998a9f79.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 0x6ca57da6f24222166ad931e9bf149052648e6f3410bfc4b15885f2606b9ed790. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NZRI12102654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e5f575aa32149cea5da82eb2d78609bf61bddb29a0ea61aaf05a3435a08ed9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NZRI12102655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0df517ddcae8e149a7b10453b31ccb62c713b113b7652c309f36edc57d3b8d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NZRI12102656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e255dedf438bfe07f44016eb935e3d7dc3935c168418711c3ec97d42b693514. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NZRI12102657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c567de1a5a906dff6dc4c17b19654e4c11ee5f46d9bd7ea27975359c54d81f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NZRI12102658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b75f5a25b5f635e46ee145a7bd6fb43385ebe0f5f5fed6ec49d77329a937cb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NZRI12102659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1051c022c6d1a0530cf0b0d52f6c7f5ff734f422d24ee73cd9ac3fae5304320f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NZRI12102660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed183685056d72ec98ef20835971a51d8b92b85b96419528eab070e8745dee7. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NZRI12102661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819c41b3358615ad9edd0d24dd0ecd90ab8b7631a9c060252ab98b06f720523d. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NZRI12102662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacae3f427e4899430476d113cbe772b13cfeaa6a04ac0a313907f458e89a6fb6. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZES72313145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1709076758bfe925db8531f7abf02f42a8428515732054c78ce4653187280b33. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6P2201548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457f988765305f7d60f8c407bb908dc7e329b911ded2fbc2c8c51918135ee786. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES72185220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d9790672c061e04dcd7e9dab982499b7926b7b76ddf7c9b75cf3ab22e080f5. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZFZ62137558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44db85841acdd48f2eea8ce479e0d988b12909065b9721c0ef9543bd44d1942e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ72078915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce155a8766866356a82ef33aa12e6aba0aaef270dbdc97b88eb82af3705b740. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN41934077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f8406faea57f2a01b1152a1472c286c3a6f1c493d3e24f98c10383ab73aad4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBSMU6232122.