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 0x295d040079833e916a4f8d76fbd38f28db0e4ae54238e6a4c7a80ecf900065ca. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3aa818a9-044b-42cd-82cb-c34e9c6df5ab.json and https://artists.proofprofile.net/proofs/artist/3aa818a9-044b-42cd-82cb-c34e9c6df5ab.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 0x72f0695c823ec4205ecf188e5a27448124fdabbe518fcd909b54f737094f15a5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM4TX2325485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9772cbbe903afc4f546e67da0f6c4542108d7ff69adc79afeffe5c51b659aa99. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QMFMG2375198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40948069ff1fd18edee9690e14111ba1178f9d34298035b380736a84d74334fb. Chain 2 (Bitcoin): anchored in block 957552 (2026-07-11T10:04:42Z), 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/QZES92440430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f86dcc1bafe37d4e5c3819335c6e105168de4d4d9f6a686d0412ea5e551967. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZHN32494973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5f94331796e7a960b8a87e83afe6bb08fe9f368e44cf614100e4c2c6dc16c0. 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/QZK6Q2440916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433422455cfb8d3f01f6e87280f2a348e72378c330d2ac97820fbd855efa0a57. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZK6G2402609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb751abb2d5559cb0c5453ef1e06e33651b50b68606d45470a7325fc9333fbe4e. 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/QZNWT2414372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7629f77eb403daf8fdf567af2a3bdefcf16a75163a7e6feaad4ef824c45d3e. 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/QZTBB2420208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4b74b32344cd8b9e2de405c21e8b70804b127584ad1eee500fbbe1dd60bd6c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZWFH2434884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ef8912c806e49b3d4878ff038363c76068bc1b2db8ab684fa9a2f4edc7c14f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZZ762432987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55f9c1a72e09d26176e62ea0aefa4d39acf38bfe71f8ac6769cf7c628d05c3c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/SE6XW2404156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6ed1788537b2cc3c8a945c820b7a8e3dc5bacb6288cb1bf6e3b17733805341. 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/SE5BU2535584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e057f87a3cda24d101ab28b960e1f347878b405270875ba47952fb889777683. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/QZHN42529507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4e21d722bd3d596e6f41e9527f067c8092786ab3aa472a181ee51871d99b4c. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/SE6XY2555968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100d1f52f2d63d5824d335494dc8384f57cefb40e77a30f7ddf2fbf14e663d3a. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QZHNB2557923.