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 0x3bc36f6981e28b0761e43bcabba147a7ca4d844dc267b03412b93384bf1ae400. 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/5312d251-d6ed-440f-8290-1c56662b955e.json and https://artists.proofprofile.net/proofs/artist/5312d251-d6ed-440f-8290-1c56662b955e.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 0x595c1a0cc6a7d0425b32af0846b5c8e4b59a59e04b722359795bafc133763d7b. 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/BRRGE2005403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be24531b51eba06d6390191debd0f0d5c657e2803a0b7f3b242983e7495d6ee. 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/BKNDN2300043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197e5fa0a206f4ed48d94ffb0e0735ab3dfcb997592ee89373a01a30ba7d1218. 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/BKNDN2400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ef58d43ed1cc003e498c7da18a757b2c07f853b66b68658423b84d876d30c9. 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/BRRGE2301026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc477ac422cd8a9baff3815898fb7d12b2e5e5028228ac77b9672cb8ddd6e88d1. 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/BX5UA2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f85076b0480a93c51c5c22c26686cf44f2a072a830b3e15b3db9bf6bb75fd33. 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/BROGF2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7f1e93787eae76ef03e681ba51d9608f4a2318e6f9370edfd58ae7cc80c9c0. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZNJX2374932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6b38214e1fe3160e033ac45f222e217d040d1afd311564c4df06cf312cc0d1. 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/BKNDN2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5535be49f690ac0215c9c031c027cd9ee41047efe162c2590285d7c266516a4. 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/BKNDN2400096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3414c98a02a708b0c5651499fe649108ed6c57db2a63c18d3c5dc189d586e258. 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/BRQ4H1700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e34a74ecf372e52f85b1db2d703912e34bd7c00e771b7774fce7e5266516fd. 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/BRQ4H1800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc892f44d5717d1d5a9905e966f8178d1c018dba5f018eb4394d209849425db. 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/BXD2J2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff93edb42de04437930e05c3813771b1a651b39f563ec205b0e8ba3c7831b1d5. 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/BRQ4H1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea77dbffb18886243b15ea9e9f613653488826cd67d67655a51b8c2c23e8990. 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/BX5UA2100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b03e0a03a46aa892f93c1ef19c3103c839cc8ce3376a2bb00da07a8636bf08b. 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/BX5UA2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ef58d43ed1cc003e498c7da18a757b2c07f853b66b68658423b84d876d30c9. 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/BRRGE2301026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd65c326ae90896c50ea69ac811c34a5419c939e9f962c431125469523a0bf93. 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/BKNDN2500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae84a9045a11627ceb93169571e460c511cc74af7803f58764ec54e2119b0911. 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/BX1441800019.