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 0x6a48703213fd603521112b8ae2b7a516ab7aabec2161de6abf2aee163b04f664. 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/e6f07a1d-891f-4919-ad6b-d97892035b64.json and https://artists.proofprofile.net/proofs/artist/e6f07a1d-891f-4919-ad6b-d97892035b64.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 0x57be7f9a93207d6ebd5538dee13ce76d259c252b03ce84923269885e279abfbb. 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/PLC062224779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb7a094e373adb29b0b6fcdfae7d252ddfb27c4cca81127259377dd930cdbff. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/PLC062403855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e9435070c98d0d2aebc5a4f4597043ef146260bc9af76fefee61a362657219. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/PLC062413248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c7dc68bcc737ce67744232364fb9915e34a0d78bc2d5580b9ad746babf5240. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PLC062417314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17f4b8687510d484d174e6336efc96aa2561a83324fb0a1885f9afe40053afc. 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/PLC062417338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff54e57040df04002054367d3e7aba8f811ce8def13dd18009e4bfa9802ccff. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/PLC062415928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba78be8b9e5792fe36efd4e4973030e50c6a3398d910faaac3a3c2e0377aab5d. 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/PLC062424557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8438a833a8393e4787b7b4b67faec5ff6852ea834a4fc99f2e416704e3316f. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/PLC062434441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36aaf3124374e301e57fe1154c4f400c71724312ce1136b5ba959efa98abbed7. 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/PLC062440489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb12c57d8fd2e149a09af6ec147577086ce201404f9d5d6df72f8026b257b2e. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/PLC062551007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f847ca317989fbd154271c64cd9b02210e9e424fcd3c3b3b3b076de06147a0. 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/PL4K02511428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b1014dde781d75eb01ccd6c12660ed9af2486faa8e42e7e8fb4a8f3c8bdd38. 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/PLI362333124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5469eb1258fff98af355eb976f1dc2d56b931b5bb65c54bb568b10aad5485196. 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/PLC062409808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272860414da3e60f2607f0b33a09aee72ed7f78c5dbfb5ec0ac345dd3a65e7bf. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLI363521980.