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 0xbef5b7bfa11fa87b1979fcd03c87fce6534f655e68840015bda4665c30876be5. 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/87c16f5a-9219-4345-a538-e99b45e16b79.json and https://artists.proofprofile.net/proofs/artist/87c16f5a-9219-4345-a538-e99b45e16b79.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 0x2f0fb6578365490f7afc66798e7cfef11ef4c8a72d3e953ae91555698525c09e. 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/QZHZ62204081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aa1b6fe348e809d8887de38556543332d04ef50cedfcf61e98839849be6e94. 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/QZNJX2237889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e0eb8ee6f333650f04a37a90fc848540c445a395b0af03a0cc6ed2444dd7d0. 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/QZNJX2237882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95c8411cfb82969d996eeb20d26651dbd8f3a08166f545b6bedb6830f13abf7. 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/UKXN22412023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576af7b376a49cf924eb9afe4f339b330d19cab16716507211502579e337fd47. 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/QZW9N2208608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ef6cab98ceb0d8cd6413344d15e22aa57d6c5cd63e16a8b00e0353f3dd51c5. 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/SE6SA2461597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ce696f5cc5c4770e087799b2d39be33d8ef41df9fade11b98f427ad4398a41. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6P2099545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bad241dcd7d12ca171c10ebff44c5ef5573cb7133523c591cd1e484f699dbc8. 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/GXF9Q2539996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5789dcf397047105164ec2b5b2e822ee016c3e7cc95a208f9bb6e5740553524c. 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/GX3Q92506780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5940a3ba8a764c6a04208fb9066f7e494c89ccb913a8e4afe9df81d3327f51. 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/UKXN22545892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33dfffa1d734a37d9496a5ebe5dd698911f35f61ed0803514fb5b931a3e027aa. 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/GX3Q92506782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c9d68a56dd0aa312f7da893a4042cfc1a634824a05d7da3983c1555f550928. 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/GX3Q92506785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5940a3ba8a764c6a04208fb9066f7e494c89ccb913a8e4afe9df81d3327f51. 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/UKXN22545892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bad241dcd7d12ca171c10ebff44c5ef5573cb7133523c591cd1e484f699dbc8. 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/GXF9Q2539996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ef6cab98ceb0d8cd6413344d15e22aa57d6c5cd63e16a8b00e0353f3dd51c5. 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/SE6SA2461597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4814a7b2e6248a797aa658e1cb648dfa1c7a907de8c9a10fdb0100278c0c47. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLFP2306374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7f96a5296fc732bf8a64a279ee5c8f6c723e8b7375f0e53f22e2c556780f7b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBLFP2314932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991e836116e14ffecc452d107d155411ca21009c44a9f1f7602aca0a31dbc527. 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/GBLFP2332242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1a846e169dd5f8b8c5b21cb098247283030731856d0fd7398ead45fc3eb4ad. 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/GBLFP2327933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a3985b683c3c2d6af633fb36b3d9f5e7cd413ddfbae129c3c2ce4d206ca774. 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/GBLFP2332243.