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 0xc86cebbdefe8e7763a901ff76a82a500a1c32c1f4a47d96f9838fde801c943b7. 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/1ccd0641-8f95-48b6-a3ee-34b9172ef174.json and https://artists.proofprofile.net/proofs/artist/1ccd0641-8f95-48b6-a3ee-34b9172ef174.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 0x3bb825a7f96ffd6c942213d3f64f94deb82577dc56b66a9cb7562c15ce541610. 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/QZPEW2493068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c01e293a1cc1523da7128bac4d7c7c70343f282d9cb9bb4836cabfc570624a8. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZPEW2493069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa813393283ee379de4c63779929f319917a11a241ccda7a5c187639a0f58543e. 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/QZPEW2493070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efd348c56f77870b06fb7cdf59cdd4225bc464d17d852b3644ff4a918fe749f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZPEW2493071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaaba90753db09c7b6cef87862b158e49a2d73a9274153e0e0a8ed9eb2eeda97. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZPEW2493072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbdbb9044c993f89eff7ba360b526865499d406dd3fb3f356b39e5ac89e47bb. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZPEW2493074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ac52f928f06614a51dcc8cf50bea59889081293287b7c281c7f43d72001019. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZPEW2493075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb7871a4addb6db8075412d6d5fd0580b4e4aabffd6b1682a469013755dff5e. 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/QZPEW2493076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3333e6f23cc988deae0a4134f3fd4c80bc6ddab7013d67ba7f1c69577546f8c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZPEW2493077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50afca140d8eb41662b0dd96979785b96675a24cd0ad2d6d23fdd5ca28d8bc2. 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/QZPEW2493078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3a03aa4bca1bfa2bea328a55c54700b0e36328c54b377d2537000050578534. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZPEW2493079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb4e00735136e5a4758544c42fa999158cea203cd2632ee03146a97482e37b9. 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/QZPEW2493080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f060e1e9a6d694bf5aac0e7f98dd35c21fcd48e5129b8f6c9b4dc187cad0476. 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/QZPEW2493081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dd9ff6713a5df71eaab01ec73ed9660515dfa191eb4a1f1b621a5741888a40. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZPEW2493082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcfb103d947b6c4185316b3848ab6009f2ea97e6207e7acead45d0dea17703a. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZPEW2493083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957e1eef7f0a295112e7f065d76c12334daff51959c0798d836fbe022c025981. 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/QZPEW2493084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ef097b8132418d36430d08748adb16b42cfd5e87fe3396a487d2a165e7289c. 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/QZPEW2493085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95194e241c83d4a443d926631c1755d5d92463fad84e04dc77ab1cc919b17e42. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZPEW2493086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c55be5d244a7fc7f8fc62ffb86429f3d20551710f02add6a87f2695aac5293. 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/QZPEW2493087.