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 0x4895d212a2a3e2a60f5cfbe6cbd55b719295801d7aeb2a5700a88a9cc704bd09. 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/a506ed36-c658-4af0-acda-32844b24b201.json and https://artists.proofprofile.net/proofs/artist/a506ed36-c658-4af0-acda-32844b24b201.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 0x20de7083cf81bf0fb0f7e07f97451a0611a90f8b48eb741ff6eb3747cc1e92c7. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWV32412070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831e20d1f723ce747709995d7476791cf5b0d3e2aa767d945f2049406d2c79bf. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZWV32412089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337a72932326a3072cab38fc15730a3b9904d7b22767fb927a9802848e491fa7. 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/TCAIO2407633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0163ecc9fa28ed99b4435c15cbb2ed87ae2e2e4b7a50eb12f908d4a8110d354a. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAIN2447602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070180322db746d9d37024428c766e94526c9c4d2b2fc13c151a3b7798ed6878. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAIN2447468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3635905d022c40b0c7218020f0bd021b8845eb9c430740841eed7b4a4fe0f1. 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/TCAIP2462899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e0d8df590b204304f3d3ae3e9d4200c0e1787d0bf88449944c472035a1825e. 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/TCAIP2462970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa324eedb946d91b5128e06568efd9868b9563fc22f05922d7d9bb8bfef671880. 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/TCAIP2462974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfdc8fd2bb93166e4e044fcc96c498c1992a2502a02715e982b3e4bf1b35c02. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/GBMA22374824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe496ef16ae6b6146223d059fe73239f08143417f2e9fe94a03514b6ea0dd8ba6. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAIR2442134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3edd5e0007a110bcc0544dfd2bb9153abbb7e4bc106205cf2ddaef7480e7c84b. 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/SEYOK2421397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a2b3d646ff508898212d6711f22c6a09ff572629e59f049a834e3bfbf83fc1. 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/SEYOK2421402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de33e4235ab2c7b5b11910887842abdf6038ea4e70a10f1f4fddb4740f7a043. 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/GBMA22374817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66de1ca68a8916d6070eec5e5e1c54b032ba6ebc7d4236550cfd09a92a1af478. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/GBMA22374837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e661ee2e53e81088a292acc0b4d918c94b78c7aa52ec84776bb655a60878a7e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWV32463886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db1b1d471898af8d8e4b793269b1d8d42d6bff02b62b21dc240d23495f4623f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBMA22391593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5ccde7aaeade9871b2e4ce87245c0734ab2b688e977cb402b4ba62890c4983. 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/TCAIZ2408627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698e69fa0b5339b03dd22a0ac9568f28e4b913ae9662facbe6ef5bdda422bfa0. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZVEM1845100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0198250ff8cd73d914b885b12bdd7224d75ba5b2a4297657ad5eff771517c0. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZZ7W2451991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4e6a2cca2f218d2d85c049aa0db96361430e34c2c4c69e28bcd28ff618dd99. 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/QZZ7W2451992.