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 0xbae94de9a72333bfa7ea003836866e2db18dd247cc9f50cd8f6c137b8338f365. 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/334152a3-7f14-44e1-a103-657ec8661252.json and https://artists.proofprofile.net/proofs/artist/334152a3-7f14-44e1-a103-657ec8661252.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 0xe73997d477a527e943b320f7805710a9336bee395d8ec818ed3ef139105e87a7. 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/QZGWW2074003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e24d2e74b06805cd433cd89b7dcf8341fab10b61f9e7b2ce4d026da2881a182. 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/QZGWW2112458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3554a870eb2d79eea7836382e59a9795008f204fafcb6167efc7c67a6c43602e. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZGWX2002331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f6466adae09e1765acd920950c96e71a17313ae36424c4ade32b0cf85ec245. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZGWX2002332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb28190b5dffc94da4a3bf5d8cd6cd4e5f84e0247f1bf55bf0bb2ed326d5ef53. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZGWX2019652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63a186dca938a15fd266ee4dc718317e62f7e27f0e7b10e4fd6bb6302c42148. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMRDP2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb9e8ea930dbc98ea2c9ba17c6a933808d6c965ea2feffdd54588a2fa665bf5. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/TCAFT2154000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb50f1e40c7540b53da83194401d8889df1a739d57979615cc066e128172242f. 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/TCAGK2273407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82701d4f93eae31d4a3a4470d8a083d44826d47e820af42a6174703c5b2c0ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZQAY2493074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ee8a6735bb8d4c4f0a7752417492e6363645c5096b10adba5c3e4872750a98. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZQAY2469301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6e3c8a79159d334caca402df984050294f5a3290589331e5880e057e1e437e. 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/QZTLA2444174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76e53188caab95b4785cb7c4a0f622ce45b831ef044df721d88074bc16d5caf. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZTLA2426135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac225fdaca0443cb32769920931998cec8d8ce575ba57b86da17f966f267e0a. 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/QZS7J2479846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98202df4d9cadae2e98be2dfbd7b13b251dda2aca9c28c25ea5a6e84571a34c0. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZQAY2415037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77dee68485a62b654fe6c3186018c1cffeed13ab3dfddcb7eccf0816c1bd1d9. 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/TCAIS2410602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842d42cf3cefba8f3a60de27286a739d0edaffa8ff59bff1a79e68b5a0f6f76e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZQAY2519112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b86d84eec4c8bc15f87cf37622239c342b5e93ff877d774cee6e473a1e01d9. 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/GBDMT2200103.