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 0xfcf75df22e7ad292dbf817a96037003943093af81dd2961cb142624a4b588fcf. 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/ead09f09-7b20-4896-a6d4-e4fb6bb3bf67.json and https://artists.proofprofile.net/proofs/artist/ead09f09-7b20-4896-a6d4-e4fb6bb3bf67.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 0xcb11cdfc182d968cfa1f4f8538c192242279bccc4d78c3b84b9b3d996f5059e2. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QMDA72473471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d85c90ef4edae042dad67489d35e816c22653c4836bd9346b1d8f216a63b64. 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/FRDKW2322460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2fa78f0f0fa1c2161dc4e0d32b5abb3cf262838534db95696f59d45e4dbbc6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRDKW2321416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc1780de86b0f9e700dcd3c962082656717bd039b6673959ac8598e514a82d5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRDKW2320385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bff657cdb1c0a669157b577bbfaa8450a7114d16f201122d39c8ae58dc4044. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FRDKW2321683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f37e6c224ef0777acd40bf6c15e19e4ade449f7eca9fe6cd7b51cd2b9337ca5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FRDKW2321425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ec36903e6838c19f381e72f09f9c13f3e47f915ddcd935877c2d99761aa1dc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRDKW2320434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e2d56d7a40d2858416b3d15e754acd35047bbec33f25d58c2ff5f55f8b3c39. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/FRDKW2320551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4813269bf4d6612a742aa1810e2bc4853534c08a7ec3659dc0bcad8ff108873e. 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/FRDKW2320809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b9b49d80cdb7ccfa55f2c37368405656873777923a2e16ec4ad4883c4a508b. 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/FRDKW2322654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bef6ea7c7e1263b49fb7b71acf2e7f19c31d7b11f99e65a8e9ecfe65a8e6f48. 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/FRDKW2322659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0f35e19ea6a8113e5ceff91b1c9d1a4a135af6333ebc68e1b58f9450c565ce. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FRDKW2322413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736078ad97339de2635e48c2e1579c3877ec5879fe8c165aa512de022cdcf421. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRDKW2322551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dab822c43931ff07c626660e55a7e0c010368ad693cb5afaf751d301bb24780. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/FRDKW2322553.