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 0x09e2a21b70d17d7447747b1aee42ff57dbef8f460c0b9212b9733cc4b738d195. 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/c75b816f-2aaf-4518-9286-3d170cd652a8.json and https://artists.proofprofile.net/proofs/artist/c75b816f-2aaf-4518-9286-3d170cd652a8.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 0x731b1c1eae9be516ceb2f0b95bdb43725194f8d536ba3df5d0edb0939c32a6eb. 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/FR48Z1300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec827e26c5ddbe10318bfb8b7bc58d346bf5c5bd2a255b8f691e0a4bfe9d50d. 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/FR48Z1300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef4ce56482d294627e29e384531a78607d5827a848396cca8d460ae1d2299c1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR48Z1300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74391366f87e469984671567d45bdbfa35d83d583c7ebe7b8e9c6240409a3c97. 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/FR48Z1300038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c3a9201af7b3812dc310e3b77daf78f672f177947a9189a6f4a8d03a60290e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:11:45Z), 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/NLHR21400612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cb5d34db8111532f104f97fb226f0e1476aa41589d48d88e54f179d6608c81. 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/FR48Z1600077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1f60b4fe9e9e898c02b91f9006ab6ccc8f59d57cc56c660a26c7d5db52bd55. 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/FR48Z1800068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d0af372e4e9fa4aa8fed6b90bc80dfa7eebe4e2d480d408926b781df9dfe16. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QMFMF2451387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6805331c9ead6025bc03fa5a2e546490c766ccbf1958a2a2ecc1ad800e9d4d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR10S2588197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a747e6a02aa10507949a976cd7a7cc3051902a4b33820414b2af4141f8fafe3. 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/US83Z2505790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff17fe1d054bf67beab7530588cea1f184bec38c60eea0ed89be1d985df4958c. 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/QM6MZ2560421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64c6130bee750c9027612580507708242ecfb241ce71cc683754809ff86cbd4. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QM6MZ2560430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0276c3062a5aa4bbd6125415bd30944c2a55c1e25b8d42c8b7085243b617d662. 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/FRX452498590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7827e432f2b6d93b303c5e38dd72345ce2ad94c9a57a7fc2863440d63541e11b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRX452498591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82498c3c410fa68fab470a165c1e7ff598538678e7d6730c405b66fb8a2f8f99. 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/FRX452498593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496dc14938ba750ccc1afec97d4ef2c1afd88f6a2dfc34ea5e3249faf5e2fe03. 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/DGA082307115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2665bc184fa7f8474860cdac957ad9566feadf44175609fa37866635bae0370. 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/DGA082307116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e273269108c490b93acb52e87b4d58e5420016b1ca6def121b2ce20c85b9a2. 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/DGA082307117.