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 0x531d748e7825b895870ff2ce659821cf50084da4eadfb925017900ea0e4fb7b7. 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/3ad4ffe0-b767-46be-8e6b-a4bd4e4ca2cb.json and https://artists.proofprofile.net/proofs/artist/3ad4ffe0-b767-46be-8e6b-a4bd4e4ca2cb.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 0x7b1e2ddc6754afad55259fa5e35f68eb98138eea400da524ed79b01b76b67344. 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/HKG732341613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bef1ab44554f9eab24f325d02a637f937c3e94a0f35ffe1d76a985768de1014. 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/HKG732312348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44ace4c8630f359448274fece73177da79dae87d4d41b9fc6b2455bfc8b302f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HKG732292483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2906ab2bb2d9137f854586482104128bfa694c1c423ff0c02ca2c1622da323d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/HKG732292484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9c368e62d524c48bd6da43aaabbf850636eece8266c52cdd6d9076758b8878. 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/HKG732292485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4491c1f7ebcc3e1dda7b0fb4849dedb39e1d8abc756946bf4b464477074c05b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKG732292486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5072d392988bf1f5e7512a6e2551b1b56af1b1d7841665e71a7c4955718538c. 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/HKE022234774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc612b6b712a8049c10eba3d01d243fd42a72bfcf49d917937d318d6473cca76e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DGA062403653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fc9f604f084127ee06727051038e76f33ddeb9aef9a526316bbb3b1fe94bb7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731686115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb493e53de6fe0b15c4a15f067227aaf57c5877b59631d64959887bbd1db57be3. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/HKE022258056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1092f81201ee5df11f2d8bb106daf97ba1d9b3fa140f98b7decc6aee63ab3949. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNUM72400251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd37b5f53ef86a31f27e05ba95213268878bf2a0844a271bbc54c48412feee4f. 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/HKG731603284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1092f81201ee5df11f2d8bb106daf97ba1d9b3fa140f98b7decc6aee63ab3949. 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/CNUM72400251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5934e6b07b4c2aacff66f0a9b82dfddaba36c04cc2a0def1ae1c23340a58aa9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HKG731678395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6dc7062e86b64b5c7c017155737bb894e7dcea325588e0ac835aff6064e9e0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKG731678396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca8c2aa49d91f4a71fe5714387bc533841eb83ed56a3f47e7da37242b4f6532. 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/HKG731678397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0690cc87c8e5cf64fee69f643a324e0f7b8474225181d8524aa353b28d694caf. 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/HKG731678398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb862f0b1bb813a60f1e233d26ef3a08db3bf1b6866ebacedf8e702c7889b79. 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/HKG731678399.