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 0xc9118015baaa9550f1ff021ddb89c5329cafcc41b3cf552c42789bb06dfed8c0. 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/be12f74a-0bf9-4357-b4aa-23ff12ca85f7.json and https://artists.proofprofile.net/proofs/artist/be12f74a-0bf9-4357-b4aa-23ff12ca85f7.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 0xada2027897d576fa158c272bc984463d5e79f0e04cbc9fc697dc1221aa0a2487. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZNWZ2450868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898efbe77762100d0c226b47c1116e5cb7e23ae054cf131a8c0271b785c24265. 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/QZWFT2476746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a3bd005dd5841fa676f0fd31b5e5306801a68e5fb344cd75b199a17472d47d. 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/QZWFT2415255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7a05783faa951f59fa7073f810dd5ede64ba44afb883cc8eb868413260afd1. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZZ792434177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ee9596907ee76fe0fe55783d3653e2a86b738f659691d45a805e398642f690. 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/QZZ7Q2428192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19c076dcd4fae9578433945ed872d88881472c208045f3df1012644dbd80a46. 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/QZDA52506732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ef7fa5c4ce26f06383749b9540c94dcf417d5850d19497b2c0d1cbca547748. 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/QZHNC2555273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9da1bc2c2dacf6b3fcaff58d521a245ee1c3a91a0a33124f0032b0d5c32f85c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZK6L2500417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c67b914d5cb0eeb1e18a55578bbd9f52bbcc613c2fa22f6d860c8598a82d28. 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/QZK6L2500418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973bf788c465f31158e7b7eccd380165ceb7ed2d41fe3281f6171867ebbcc01e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6L2500423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5bf067ed69667b4e349b55fffcccd2468da1e50a94832dfb7790fa011b8462. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZNWT2530119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4b6b0a2cf52e5188103f25de3f812ae3b021278ca7e188a77c02efafb5b4da. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTB92554482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57dd387262d62547ed05f5a5e32f9e2720bb1a16dc0af56751ceb81be5a26603. 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/QZWFQ2536668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ee5e29b2665d282d89523933c28afe6ec41561a9c6b9af2cb99ee8045ba980. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ7U2532672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef5265337876b58f3b7347bb271f5d70291fcd65aec60d24eec45ccd484b2be. 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/QT3F32531208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1b67ec47a9358a15b16bd1f09d0c564fc61ae0dbc2c17ee30c4f4ffb58e18b. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QT3FB2520401.