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 0xf20749241257d259a0f449bed50139d7b0ece432fff79d922e35a72a555ebe58. 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/6da24ab1-9bf6-4e6e-bbfe-d2fbc6e4a6a2.json and https://artists.proofprofile.net/proofs/artist/6da24ab1-9bf6-4e6e-bbfe-d2fbc6e4a6a2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
We're Here Because We're Here: Songs from the Great War (Centenary Edition)
Valiant, 'out of the Fields I See Them Pass'
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 0xedffbfd99c99a01cb5826c3debee22b62c4d82a8e28340052f234bbc8507599f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GB7EG0900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e18a62037c156cc50c492ec1a271ab220abfbb0a7b69cc14aa85372c10bca28. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GB7EG1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3fcdd8c7edc42143db0325825686a07e22f9072c4fc83097b0544ad322a8ea. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GB7EG0900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b7389702f8f6eecb2e2d6ac9a9931692d9c8cb5e94fc5717b9e882d26a5c76. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GB7EG1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2975937d8bfc4f68e203d05899aad6e3ba6f9b7740e64181b52fda9a972e66e1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GB7EG0900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00907e5b802e801f84675f1296fa7a5935f1c35ee06c63a89c781f627eb2829. 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/GB7EG1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa121bd9009e6e49a96b443c49a7526f5ffd79c34179aef1ec8565561b6dc0ca3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GB7EG1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17042131a74abf76ed70427f00b4d6f2421dbfd5ff01d0e15d175cf5f50e1824. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/GB7EG0900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e608709d05f41e09760a0a0ea23cd04bd5a6d1263adcbab5c413bc670faf475. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/GB7EG1400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7178e90970c3a41ed58315125aeac465df1754866e26ec50ecdf623ec9e15f8. 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/GB7EG0900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5eb1d0dc1572719a6ffb0daab7d9a77fbb7341c4960165c27569a720f0b049. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/GB7EG0900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93be68f75ae52a8eec48fe45dd75573d1ee4b4c76c59f23c82dda442eff479e2. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/GB7EG0900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579ce09b392a80b61391a04d8cd39578518563cc1ce839c3e9af91aa13f029ab. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/GB7EG0900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1e883f48243b05159006484816c88450fd023b43af79ba7bcb842f9e2b47cf. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GB7EG0900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684eb0979fd17aa9d64025cd5b70ba6f30bc77093604ec853c21d1c357bac37f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GB7EG0900017.