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 0x7e92146b4b86889d12dee9dd4d68842b83d214220dd806b3d0afbd24232f89c2. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e72009e5-c776-42d0-9383-45624fd43459.json and https://artists.proofprofile.net/proofs/artist/e72009e5-c776-42d0-9383-45624fd43459.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 0x652618f490683775870ad6b898f000e2c34657152250ea8ef085d9084b50da24. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/MX2831000480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333a75c286923aba707a58822bdc6859abde6df271dcc425a26c0f535983200c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/MX2831000481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65606f8b81b4c2ddde550458259e91e9062f6f09eca63e4fef9fbe249db5711e. 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/MX2831000482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d405d26af19f730f03e30c566d568823eb60d600b347914f809fc2acbac9a96. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/MX2831000483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d513b0357e0a389662b73a74d76e036c56170a0eae6437864c0ce18a82b021. 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/MX2831000484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea8b7d6bc369536aea6dfcc430ea6ef5c5042e1b2c6b64143a0ad3de150a805. 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/MX2831000485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ae0b5000241ad3174801ab75657e74c144b5189aa1e16d84a9641835bc744a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/MX2831000486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2459cb6125ed88bb3bf054db3c49034e3ac8bb298b84e1652962bc6d3d7e3b58. 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/MX2831000487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5878ca9a1124107a116619dafd6d2707f5daf987c29da99e5d89bd02a43109b0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/MX2831000488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3418be3ca27a49c1c261120376d51084f430a4c79e2228a85a94d59f2b8d040. 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/MX2831000489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b5b657aaadae5cc0ee533e10fd090fe3f11aae1f86363df76e297e6ce39327. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/MX2831000490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6946f29b933892b1cefd4b857027eab8d5ae2a5496826e84325014d7a6da4490. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/MX2831000491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e511789a01be5849e953f7474ecc9a394cdaf32f80498336d932b69a72d966b. 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/MX2831000492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a629abd7651616eb8ee8421010b4f4eea8a6e8cd1c70823086b84c482e14f7f. 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/MX2831000493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90f416a553a7193eb148fc87bc093b79d5bc9476fa741bf6661890f6e73d225. 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/MX2831000494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc00472ab875de308f4acf62b8c792df3978b360353baf36714c872facad583d. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/MX2831000495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901972c2b61ebadbe214087f7e691cb2bbce6788ba98e96ec21301daea2a620a. 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/MX2831000496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882e7f530f4b1a3b7b35cd10cd4b79da3e4d621c3478494d90f70dec688e396c. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/MX2831000497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaf97adcbbf771eda04d4d2b3934ff0ef41095848ab064c056c5dab65ad0277. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/MX2831000498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0c1d950180af4df1074295f1e9813702ed923b77b48224a22cb95dd351a3a3. 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/MX2831000499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b57196462c4d1643ea6b6d2551f15b143756bf820fef5fe703da5fd88bf9de. 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/MX2831000500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65276a1493a57eab3300a26ccd28b602c0ebfab5d48aead7914814dac291142. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/MX2831000501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84925fc2ea2ce9b6e4176eea3ad458e7d10a9802343353c29f40caf156ce1099. 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/MX2831000502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb5ed9f1fd7b96d2beef731161059639ba8fce942158fcf44047b4146c1a19d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/MX2831000503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aed19323bd66ec0092d23c669a8afcd203ebe452e8dbd715cb4dff3e298ba67. 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/MX2831000504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295722755499099f6a363a78e1885a2f45d07b494a38fc3a7d88a7fce617c743. 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/MX2831000505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4632448f4c1674cb48c1952d8e4789e339674f300c37dec484d20b302e7fc17f. 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/MX2831000506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f80931614acaa2a56557f3ccc91dfa2f11cb1761b2ef87cf78705738bf03842. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/MX2831000507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e76eca5efe0547dc5437d6e2850dad04a0c41e0a3e36d7fb4a26fe458f64f7a. 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/MX2831000508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136a3c7bf968aeb81ad996739b6a40fdfc7b3f54f3a6abb90e77f73cde2aa09c. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/MX2831000509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1696c7116c2b641b2b84d1f6cabe944994ddce3cdb08886c7d9e86f0479088. 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/MX2831000510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8617cef4ceb916a44f6b5f8cd753fb920375d98020f96235dd42cdde9224de. 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/MX2831000512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76974c0c8d2a93c61492c85cddfb91ff8f45b8ef97bbc1dc46360ea5db3ff20. 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/MX2831000513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5597dfea7085505fe0db067e6354e35fd890e7588639ad3b3e06d2ffd151b4. 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/MX2831000514.
Kenneth Leighton: Crucifixus & Other Choral Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbec960b5b4a5f3d3ab97572729e15d9f97e76bb4ace21ba8be79c15746d791. 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/GBAJY1503911.