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 0xa0f300d6c329ff5abe9a196517a1c3c8ae59670ac6fed5b99933282fcce8db16. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4910487-a02f-462e-a56d-16481dd3716f.json and https://artists.proofprofile.net/proofs/artist/e4910487-a02f-462e-a56d-16481dd3716f.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 0xda33b94329128584e978f90069eb00e1d86c41af89c9efbde2bf54050c8be62f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHM22501958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a5491432ffd740ba2d57830e9bdddaaba82f156bd526928e8b10c39fef04bb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USHM22501959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55c0b37acf97f61873326d47035b89cb6f019c4bf894f93b25cf8e203347975. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USHM22501961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b559ea46afe8e4ee7d55166bf4d2c6c03fb6cfec964b6b6a4b5a3b1af2c785b. 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/USHM22501962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00390896764d1f3aa69dc96c641cebcfd1a987db07cfc4e341b13c55b8335ed4. 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/USHM22501963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2212aa3f133852bc56964f2e0bd17beacd689e11d7bb614ef740c96785805465. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USHM22501964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff30e8fed96fdb354bced426d2cc4652a22ab37330aa60591dc5e2e2ed2d5a23. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM22501965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4ccfc03bb0925ad6bc4b3e2d3c33734b296196d66b1eda744579eb19bd6071. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM22501966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfa199c7678d7c1ef2783e82674eb217035c3e884731a45e2dd1be139a777ff. 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/USHM22501967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebf4957ec1b7bb877e2eae6a3a9926fdf46f6f5df88682a3972426712c16f45. 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/USHM22501968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cea742d843e3bef89db06e888ef0be8f3abea4f24cbe802206709b78ec4bfd3. 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/USHM22501969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd368e8819e95b3c694399e79c33f1dcc132c92df0c108b881554f9af3982df25. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USHM22501970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa201ecd1abbd350609d3ed0cd94dc5cb4860f78722ae644b085d5bd759deba6f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USHM22501971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f311e427e0dc05bd500b566cd385f4fa272dade9ec7509e418df4cc72335dd9. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USHM22501972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836bd773db44001f2ac75f96ebf253f4276bf9acb80c81f732481419b0767672. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USHM22501973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4cbb154e103d2e0e3b0249f8c74ba280fb7a447998f4fd2ce2049ff8f586b0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM22501974.