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 0xf51e42bc9782414d57cc75f7e88e7261abd4b81c4e93fe3df64b3b61f4e0d1fa. 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/0fa32250-36d3-4509-a65f-dbc9d8a4117d.json and https://artists.proofprofile.net/proofs/artist/0fa32250-36d3-4509-a65f-dbc9d8a4117d.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 0x32268dbb1cd8b16cb7b2a6d63b5f13f3ff7ca6974ace026cef7981674c7ca0cd. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZK6H2486953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c45680e4cefc9289d874aef1bd122990d315ca308bc5714b068491b254fce1c. 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/QZK6J2457048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6476bac02ff5c3ed989fcc1b3c1e44fd684359b719a43ec0b9013ee00a2042. 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/QZDA62467955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7ac3349762414790ce1696e68d39739341145be518cef44b62a6ba8d1f5c72. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZDA62405256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86b0bdeca114dcdf95bd40f5167b81fc1de3e1db969be43dfeb50c9f2f10815. 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/QZTAZ2384519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba57b62fa11736b560b6181832f9646fcfc3d972944bc1f448c0f494e61f2de. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZK6K2344042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15733cf799d7dd3ef9f27d4f8826ea5d38f179873486bafa8caf0b47c79d6b2d. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZK6Q2306568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5475e02fda419c8ea63d40ac201660e2a6e7259358aab37f510d2b2560efe657. 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/QZES72319165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62855bb3724da4f0e5de305d6cb91504ed627f0f2d891a4bc46865b2844725a4. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZFZ72350506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cf17f6864184cdd883c52a82575440632ce088e0889581f7cb4bcd42b58f42. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB92290497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0622b3a797941ed78ab5e8dd19a5c290228f4681b41272d595f9c063fb8503d7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6K2220689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eaf1d22d88a006796324f3244e9091eacd5a362c84c19c72d40a01715243ade. 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/QZFYZ2263186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb52863f33f93b1eaa704306706553fd8b9355a8c0ef80b6fd334546ee30bf0. 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/QZFYZ2263187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2942f58b11870d05339492866ab34a9b5277be31886925b0529a6b44ca37f4. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZFYZ2263188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06cfdd6d34465ae6e04eaad313cdbf3131a6b534576e108051fa55116d5698b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZFYZ2263189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0f8d15d158139e888c4d036998b03dc75a8e43e68ec158259e0614bdb81d14. 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/QZFZ72137311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c17e9aa528648be59e1c200a713ba2e425412b494d843a2fe4a2bab845a95fb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWY2041946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919ba6ec569a6dbf1c33704f3a14e6258e9b8676f7f842ce14c23cc5960a7928. 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/QZNWU2090554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6560e108c4156ac204ea2512dd7e425e72f10c61c6bb6b3fc0f0bed754902a6. 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/QZMER2037806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec881b190219ad5cccf7b9f240d27ec67136bcc2ebee7f99f8c5c299e53dbaea. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZK6G2029554.