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 0x089bd388e55ac7e06b33165080733c04159145939d2a2835d1f773acbb91a286. 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/74334351-42c4-4383-9aec-2b3ccaf117e1.json and https://artists.proofprofile.net/proofs/artist/74334351-42c4-4383-9aec-2b3ccaf117e1.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 0xeaee10279315a4d615975c527ee5b6f2ab29de27597e3c4b9c1c7f5277ee80bb. Chain 2 (Bitcoin): anchored in block 959147 (2026-07-22T15:43:44Z), 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/NO2DY2300188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50eae7aaca378941471f52fb5a696561f90352e24274c15747da4839334e740c. 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/QZHN32155228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785d607259526fe94c93a92254fb0aa3a46ca672aa3b18fe02b0d13871ef7538. 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/NOGTA2472810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f3af164ef0d70cef4ba7e6ac8a1b788725d9d3d3e03117effa287fccda533f. 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/NOGTA2472510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c9c40f1e328765ba0926b1a50b12701ae62f49ee0941172aead7a649442c49. 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/QZES72441940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6493889bd38492bdbdd1bb17556c20e3b400bd611bcfd559f55610d6fa206fdd. 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/QZHNB2358942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaadce39eda54f6494ad1e65086a6a5474029f90118dde1d90cffe2a427b478b. 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/QZTB42209049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9f1cf0b6a806b8b27a746412dc7fb5bf2fac7b113358c12fff8c2049dd2605. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZNWZ2269350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91768081fd1e27d5e23aa60e6a24349a19681ee1bd34b02fb074f2740301170. 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/QZHN42279273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe526ea6193ea542aa0bee9031f7a3b9394eaec33d70211365570f509fe9bc4f9. 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/QZNWV2267257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb322590a329d4a4d3123b1bbf2c3ebbcff7371ee70b262e43edd224c087faaf2. 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/QZTB82247534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855660362b3141e1a2d727bfbac9f7eef54e54d8c7613a1fb2306b5407011af6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNWV2267258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434d3c44678655925a307935b31cbcd80dd97769229c6395f310cdb82114a261. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTB82247536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea2aee1f92fe394dfcd8a739255b4124f82ee26446ae6de1a630254c8b39348. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTB82247537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976f0b66a6580dfec0c61e0976ec29157ca25d7efe0f65738c036ca0128e37e6. 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/QZTB82247538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951beee1784b80085a1f2c4d7068be70a68846ec041b790c03aebc7b9e301455. 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/QZNWY2200684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb474eeec0c0ed9415f067df0c9e4ee5ba04fe6efd239a447eb3a5517dca1aef3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTB82247539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a434e37e9bfe1f043b06c39758adc5b04cf35c805624535de3252e65578770. 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/NOGTA2477510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5e543fa1b562ba7b9483ba5b8923307458e6e5ab59b777f0b978a6d328ba95. 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/NOGTA2485710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1113f6316c2b072d101a23e27a7f36bf888d8821b589e9f4655686f3b750e600. 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/QMDA62410517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d180ca072e3e1be0b07658661c4d68a98abb1354786f48ee8897790608a0759. 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/NOGTA2590510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9aa869ed8341dbc28d009a4a60f8a8543b374bebb5c12e7ad783b3be74c602e. 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/NOGTA2362110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e4fb6482540136be179ba8b41897e91309730369ab2f17a9fa6fb9f344fce5. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZDA42355412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c21c074563990f1ab7245ce83acbf8445d026a1eddb8d1518fefa7d5c2ec10. 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/NOGTH2113610.