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 0x8b813feacc67a1e9dcbc14d78e4cfa21a4df1de69c36a08b888e50655d5818ab. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c801a92b-cffc-4c1a-bf74-d76893d7fbd7.json and https://artists.proofprofile.net/proofs/artist/c801a92b-cffc-4c1a-bf74-d76893d7fbd7.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 0x6973dca1cf6cb0bc1802c4eaa63ed9f098e3b9b88e0e4d52e811d3c71705c7da. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZK6J2430282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67180590d613af366853229678f3d6075c61fedf06e9170002957656f2e38e35. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZK6F2436247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1c2f36c54e66c77ae87fe159e7b37dfd7e4c5c4a2d0922cb2f62580bb20717. 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/QZMEP2417951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa705ce797cb38ebbff157dc42eed6cea7779273bfc283e098c0b1975d4d7bc63. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZMEQ2471058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360f113c3a878df488ec43fe05a8f624d5372b188aad092daf1adb74810a7e15. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWR2411129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1819fd69c219abd82a6107bd257a7174cd791a0e06c5de10bbe8eb56f8dd9f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTBB2447815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34418c6051f3cdbc8acdfc52ed0a25de601d176f5b9c2d99df11fbafb5bea95c. 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/QZTBC2406643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6832504ee795c55cc05a83255bb9546d7e0d1a4959de8e68c1b42e341f1edc8b. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZWFU2472887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d13390c6134973dc07156b09e67c6fd33c24fcb134402ea9e711f9d85a6c3e1. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ792436113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a276b5419c12122aec1b2a5169a20c2957e617d588c7cf6db11777857396c53. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZZ7Q2459913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d41a821263d25a3ecc0eda2187c349f81d60e7cbfebc8a0b312cdf19a403fb0. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ7U2402737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030dfe75fe7fdaf7cf5e80910a83ba5b73912db7a9d2705fa3852db3c242f0df. 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/QT3F32477204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47ae0ed87f6903a9256cdb139d9412a682b53d98c23e0b80b35a07190713ba8. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZHN72558332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d401e9ee5af497aca01b7dcf83179d8c816a4a3a47e55c655bbb9f179f1973f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZTAY2541802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ead9974d951776d9fe55df563bb599c95d9ef8afb26a55899183149438d329. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTBA2584792.