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 0x605b825793179d901a6497a65c845f25d967b3741eda9927a01f5210094cd9c7. 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/02f35126-699e-47d2-91f4-e9c3fd23d60c.json and https://artists.proofprofile.net/proofs/artist/02f35126-699e-47d2-91f4-e9c3fd23d60c.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 0x1734059021f3a1d8fc14a8dadc6b6d5d45014c797ee98004cced8e4a325dd842. 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/FRX452339703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc7645f7abd6f0520147c67631309e693a7d9a012f00c2aa1fa3e5c0ab3aa3e. 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/FRX452339705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe853547ffffcbe3deeed7dc137e97e6f572a41bb9edaffb1c8f1fd5bb4e8bf84. 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/FRX872223398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4ac3c8945768efa32132e8c740ff00a5d3072af4a11c1db6810e3780aa534d. 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/FRX452339653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbeb6e17334ba4b610d01719771e4475b6ce60b358c1547c2120ee3f0f3b7332. 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/FRX452339654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f66647d72d954b97d309400d24629c406f87e0abd0354c6b701b1c8f7b5f950. 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/FRX452339656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c313efc511896ba1982597e29c651ffa4f8df31700f16661f0819e7dbe8714. 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/FRX452339659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4effa57f047019d87497f062fd5e4a6f34e190a6aba262a698572d3196dc47. 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/DGA062231783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0af0a4f6a9408739a4a70f289551d688e6fabaac606fd1dd68a632e1516a1b. 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/FR59R2204362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2cc04c22ab882478a39a29b1462c8a628c01c4e4f66a032f5c76a60bfef7e8. 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/FR59R2204363.
European Quartet: Diamonds and Other Jewels
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead8313079ae89da7b48ed94f13e63a8f875a9fcb88ad6c78c04f2e35a108308. 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/FR59R2264190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e795b5425eb10dcc48c037af44c28ac26cd34c3da41789d91f73d5ae901116a. 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/FR59R2264193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef82e250194b4293d0899852ec143cbb9cc3df7a7f2992f48f62040aa7b75bb. 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/FR59R2264194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3af4e3cadba073018b9fc3b0c792784f89f123096fc58286ac7fb2895ba4d21. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX452134678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63db5d375a449303b69030bfbe76d0377c5ff7108af711ab40859ee885b76a8. 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/FRX452134679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9664488b4dc13c7c55f578f81daf346d8277990253067b6ffde32a59e30c31. 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/FRX452134681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018a6ef0aba2bd4140d49ac8c6c1844e47c635a37bfba076c288f624add61372. 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/FRX452134683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e9fcf95fb97388073327d7e860156384506f8e754bfe623e451b4dd52dbccf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR10S2474464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2662d8278f28386518766b3ab6773bd13493f5426f46ef7baed74e1e74f9ffa2. 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/DGA062231801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50288568a7d27b317545b53e39c2b13f737e397ecd3819880107903b5322fc11. 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/FR2X42019728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c37a5c36dfe8ec314ab266ce09ca45f22ed0a70b1cbea14f6a6580904920e52. 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/FR10S2474461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e9fcf95fb97388073327d7e860156384506f8e754bfe623e451b4dd52dbccf. 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/FR10S2474464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea35b8ef8f7cafb9265e2c5d5b865b3643d0e51a7ebf4362a3ae9b44123c374. 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/FR10S2474467.