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 0xd34752c320e438019e5eee88f06873db298c991f2f3f8a7a6cb2d8ff99f8ddaf. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b9ab61c-6d7e-40bf-ae3d-283c7cc4112c.json and https://artists.proofprofile.net/proofs/artist/2b9ab61c-6d7e-40bf-ae3d-283c7cc4112c.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 0x93c89dec8ac92e55339aceadeef22b809a734f4261b2773740e3afd9e598ca86. 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/QZFYX2146852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562080a5e0f6797cc6e38a7dc0984c2514daabbdf525b52cb055d1cc2deabc3c. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZMEQ2297345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ec866b7b25e6dacb664adf4ffb1e2ba4725609eb6ee3d0f8867b2e203dfa94. 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/QZTAW2280559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b412d723c496357ad9a1a9961c1a66318c258738f9fa29720cad2deac1b55fe. 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/QZWFF2394834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4d93abe054e33b7376e332c8c91138d4c25e15e108c41ff3eb350d6c8023bb. 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/QZK6L2447332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89345b0188ce0e31c5504c9c35f47a414550dff5d7958ba9bea1e07d1526068a. 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/QZNWT2410851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da2aae5b39aedf77cc78ceba5b3954baeabad4373809b3a938ac3c7f419d41c. 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/QZTB32400184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ce8701758dc35eeac53f9f9c4c825a13d2b787744c92d096616e95a75a868c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTBD2491290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4d39fb7fe2319f75e352f8efb44dc3bf2847963cee09f56df5baf38edf9883. 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/QZZ762492034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6db2c3e0c57549ee891301b9a788a100160d5ad26d887ed12ec027d13e547b0. 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/QZZ7Q2498091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936b48b9abc714776135e90e61c902087e59fec8827a0a5f48dd5be33ad21bd6. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZHN42532441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2bfd4116f8b69de7018cc26d619686471b78d8fab1f04a8773af411760e333. 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/QZNWV2595970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fef28ebd72744eaa0fae02767275085f18d0bb87dabd6d98bb3cfed6464b96. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTB92586100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb31d79ddaeee8c79e08f89f9cd4d248da39a81dff644c7e28721d288c5208b6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZZ7P2551411.