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 0x98cb9e19c2cd9aa055e2f54275ad39f03a4c9577082dcf6eca4c51900521ab75. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc8e0afc-82d9-4dd5-8b3d-90a3849fed3e.json and https://artists.proofprofile.net/proofs/artist/dc8e0afc-82d9-4dd5-8b3d-90a3849fed3e.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 0x259a56e7be17834c995ef8bb2d357a8081507011e17faaf3f799fd0c1a34993e. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZTBF2308014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8547a020e6cd371031cddf0f30311abdf6c268ff7b974e8b3c3a92efede4abf4. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTBF2395528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caa64e29e81f8950d77619acd35c20d61fecc2acc7a5c43c109f39853b5251f. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZWFN2324561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288d5431da1c377cfaefb9b0833f9b45c4f359451abf1c654b067da9e3d2aa84. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFN2394253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac4643dd94ac00aaf8588487ae2e3cff35906c02e841317ed3a29ec6112785b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZFZ42474199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e06b065134bedfc0299398c7034ba232ea6cbe7379ee9544bd000333ffc152. 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/QZTAT2437862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad902c7806b495e6d545d424394395b681741e943e8f63572ac2096895bcdead. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZTAX2458257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a77479cc1098f1c94a7d1b9076745c763c16cd11733763b900bdb28e5371b8e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTBB2456715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37afc3ed1dd434a9010a9c2a3eeca47eee4ca0a9cd925ea5a31378eb4352b0b0. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTBE2426214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652d24118c256c17a3b6c24548450d520167b8728eb0bc854f5c937283c23c50. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZWFK2411094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217153f8b7b46642763f7a729435ee8e3e198f32381184e6477c62a4415a4ffb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFQ2492783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9db2a60852f64744d3bffafe686f63ce0da9c0ae31eb0cc632ba60581e4b2a5. 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/QZZ762491950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6453cbb2028c0bf3addb73ec2e897f36588841e1852f3b157fcd18afcb63d60e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZZ7V2466223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e45314c6d775ba85b1a2dc19b50d62e0ae3c1da23624c33815f03abf2d8c57. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QT3EZ2452124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa327110661fd773f8504a07814c6fbd6e229d87f296e0e8a01773a7379d98758. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZFZ42545424.