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 0x63ff7021e14319328f7bb83496b8fe7e26c260206c9087810f3e1d6f6945560d. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4a6eb52-7254-4d6d-9668-c2cf33a38717.json and https://artists.proofprofile.net/proofs/artist/a4a6eb52-7254-4d6d-9668-c2cf33a38717.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 0xc5546ff5382a4485ee6598ec019b92b47b78ab4d0d920158a4f5d170c185b2b6. 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/FR59R2393374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6aa0d35b28060a7a613fcae526b3dca06fa95e1e329b8cc45291290a27ca763. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGZ2355117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856fe700842b23a62fa07976e836a8d56a107c0e5902014998d17a234064a0b7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGM2247767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b816b9dc566b59f0fed9545f1090cb800626421402b56712f62acae4347a14a. 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/TCAJC2476565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b203c6ba10673fb2c6cede1e994cbaddec0f80cb4a4f48b9ca8969f6727babd. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/TCAJC2476582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e474411e116be56e35c7e04ef2fbbd1d5993dcde3bc557ee81f0072b58fc330. 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/TCAJC2476663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e0596c17499850e559a0679e3a9a255381fba0b2e470dca8c8e9312ab8b50e. 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/TCAHQ2388003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1caa55867cda97bfe3ef049986ade0a26b8d3f4cceab5db01a4e61790ce24f03. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAHJ2320415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c6c378ca0b27f8deb729fa1a27c47c1c0e9d21e3c37ff1c506801372e63104. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TCAHH2380753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424645c44d4b704b96361d2c468dbab7f52befecbffa09ee8a53d2c782c8cbf3. 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/TCAHD2327988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad3b02ba5ab654f93222efe1a2d813a84dac1166074d895aed93e5b51b8c2b7. 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/FRX762364020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53da1cf32e9eaab2063f8fc0eaed8c703d636ee49028da3dd779b420a2b6efcc. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TCAHA2380903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28391bd74d1842478690338162d149c70100294afe5eb8ecac75f10ef2c3e49a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TCAGX2367155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0062902afab82a75205c564f799d2c535afbd0a0925df9e243c95baa518e3f27. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR59R2393368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd135a9380620ea05ca1b394d8794dd5b0462c9b6cdcb067765247ae3e125734c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR9W12304969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3527fd95687c349d84ad92307c50c9775e9550700c92e34ef2ee5bf14bc23e1e. 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/TCAGQ2225686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e664fe3b6774d55ce2c8bd71490a93aaa5dfcaa47554af034ae5f5ee5137cd4. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAGQ2209610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b6f8df2b8c59db1ed165d3499ee355c289f609f64ec69ec7a81877f0cbefbc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCAGO2210633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9779336be1ca5d0961dc2553f263b808784c7065426832390eb261904c37e067. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAGL2259759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33addeb9cc115cc1d1b980bb359f84702680801ed8587bb70563acfe13cd3ebd. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCAGI2279148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f616fe1e7007040c168f25cf8d83560ecffecae36ef7e2778df391ff4f16e8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAHI2369997.