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 0x93bff8d796ca6ab0300440d7e041e6f218eb775c4b59ca66aff6cce0eaf29fd6. 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/14008cfa-7997-4cdd-8a7e-1d7eb3be2e41.json and https://artists.proofprofile.net/proofs/artist/14008cfa-7997-4cdd-8a7e-1d7eb3be2e41.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 0xbaaf09539d107aef886bc408f5194e3bd12ae1063d99a1e4617479f66a7fa5b8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWR2277700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96675e027deaa8119f0173bf5fdf4180184632714e4b4f7d79801a83d90e459. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZQAY2427249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b81933a26c23639b5037dc48f0491cb9ecbcbc458964fc7cff8365dfca4a8a6. 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/QZWFN2307926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc6f03b805b7e3a4cf8aa4312c367920bba18cff0ed43cc9920c2d48f45d7e8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZSYP2307513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa839b2f3a5e555fc8bb9727856f6febe0fda11cfdddd9be1b1f0a66f8bf155e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFZ72377935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d5bde1c7867656f089d3441cfbc2c1271a03fea07ef830190987710925352b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWX2242166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5082e05746048573ea3ee8bce80244e84c103013ccedc7b7223e64e12e0f86. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWU2251211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6356f4e3c0eebbe1c15ead2d5981036d801d121feedd776973bcb10fe0aa107c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMEQ2262824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a6cd4bd45c9fe2048c7557247513919cc326ac41808d9b47000c0e98e0bad7. 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/QZK6F2268012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3202d340607ae88fab079f0b2c84604ce00b585150605caac064f2bbc746747. 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/QZK6K2226611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d95b5a8fc9a45064c39b64df440034e129eba00ab45b6157b0fd0cd946ca390. 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/QZPLS2112496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca63f87fffb0ecb56eef1a75023fd125280d9f9aeaffd471f7b96cc17fad5f7a. 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/QZNWQ2108698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea5f1ab93b9394ff7dfe9ff4f958a08f0b17985a1d6aea0e8dc608578e7eee3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHNA2161616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9355a4611f9603e9431bd769fb35256c5ebd6ff5e8b8a564ea7b573f634cb9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZES92101035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988bf3eb30c2d6ee05541c0d5c4d891a816551827c4f2c7b4f55cfd9e32502a0. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFZ72102882.