thumb|alt=Portrait of Orlando Gibbons|17th-century copy of a lost original portrait by an unknown artist. center|frameless|upright|alt=signature written in ink in a flowing script Orlando Gibbons (ba
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9d6bf26978ac3fee744f7b0a61549f76827533a52e15f6f0d9a7b58cdb2ed1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84177e4d-6b73-4a3c-96a4-e43cf414692c.json and https://artists.proofprofile.net/proofs/artist/84177e4d-6b73-4a3c-96a4-e43cf414692c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Passages. Hidden Treasures of Classical Piano.
11 Bagatelles, Op. 119: No. 1, Allegretto
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe322ebfd20fc91606f09d04486adb3ed2f13c7ecab39b482bff110dbd8553c85. 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/DEPI82325411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506c97c64b44ff60b0fda7703338405834357b7f34b14abba40ac434558d6f4c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEPI82319112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908b16dd8a203f109317f494816e58e4d5cfa8dc0248c183193aa742189a43b3. 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/DEPI82323865.
Haydn: Sonata in D, Hob.XVI:37: II. Largo E Sostenuto - From Aeolian Piano Roll
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5844f86d8114c214846d8ab1c30a8aa9a7ad32fa91bcda95033b8ea18154e3cd. 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/DEPI82304419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67339ee772016e33a9a16866a5f67163e667abbdb44b4b75fe9fb8f09d0570bf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEPI82313924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6883312acb34db51d8bb02e11d116912cf02ead9bfded39cbe9ec047fb2520. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEPI82319110.
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
Reminiscences. Hidden Treasures of Classical Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004d93f8545cc9f4e95caf1542c0cd6024ee3ff1ca95b4aababd29dd0bbed2a6. 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/GBLGL0810031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd627532481bed5a8cddfb66497737e3fdf8897683e5a877c570778121b8d2826. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/GBLGL0810053.
Christmas at St George's Chapel, Windsor
The Choir of St George's Chapel, Windsor Castle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0688e3491329af026b050e9d79dfdd463522a4d46cfb00ffb86bd09b91501d. 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/GBAJY1928101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2484a2c1190ae86686fe959e8a104e8b35ef27e1ead21abc66be332ccecab3. 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/GBAJY1928109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a3014838035c1ee1209a7435566207edfd6a103d90bc83cb31670c3abf6135. 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/GBAJY1928114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f988789e72a11c1f2df6aefe83d5574d4d8c3aee6768dd2afb8ab2f3a3807b3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBAJY1928104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf5ed96b50d62c94102f11866c9c8f5cfb467824fba028683e65ef00eaa4d93. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAJY0548309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838229a3f037133c1ae70d5cd187832386c0f1386059c2996b3809fbe8944c4a. 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/GBAJY0548310.
Coronation of George II: Handel 4 Coronation Anthems, Purcell, Child, Blow etc.
"In Chains of Gold", The English Pre-Restoration Verse Anthem, Volume 1: Orlando Gibbons, Complete Consort Anthems
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdff10d9f2e3cca5257e186f2387a2945da4fb16a20a5edc37dfdcbe58edb6a. 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/GBLLH1751102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98bd0ebb7d4ef5df3110b764af3e2047889cde162b2376e6e383b2b29de6670. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBLLH1751107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9527271759f17651214c51c062b2cdf6d8ab55ff76488639874cfb6d9e0e63aa. 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/GBLLH1751101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766f5a59c95aee9b9ba57256e1d1d5da96fe2d30aab93af661d092de8fdd411e. 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/GBLLH1751103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46efba2db4b37ae98004a739cbe05b383110fb6b3ab440bf1108ef28707125f. 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/GBLLH1751104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba54e606c060ac14c48ce106099966e65275d224c8f7a6c6e100d41dc5e0b06. 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/GBLLH1751106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa9c73f3e9f1f516e92e39bbaa8b46d296fd2a62652378d7324094fd0a9cd72. 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/GBLLH1751108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbc106d2b4479619ee825eea92b7e7c33ceb36cb145d29d4dad6135f958731a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBLLH1751109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce8a235f963543462b72c584e6adb69bd36140831ba14902ad174d53b3e8bae. 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/CZA163364085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5616c5af14b0add969ced970dda8495e83d983dc798aa25f1350c9fc1cc4d55. 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/CZA163364070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b58d61e888c2b8dbab346bf134cff313d9a4242439a5912be44a876914e867b. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/USSM12103545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11b19c2e16b79269989a96e4bcd221b3a52b3c412a09753df56e28055f45146. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SEAEO0355010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded8c6f9009a378d7f68d7712686d9044c8b691c5be102e9478e14fd462f3f54. 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/USSM12103544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1961f06482ff82c1edc908b28cf19e5fb2c1f99c02a0c128574e0f4d69c9077. 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/USSM12103547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6788ac75e03c7c9c08debf527db9714d0dd8fe4dba63b4adce849dc31d9241d. 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/GBAKR8710521.
The Chapel Choir of Selwyn College, Cambridge
The Complete New English Hymnal, Vol. 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60089f7ea667fd4cf28bf142b4b9585362cceb24bafbac693ea9ce63b7f10abe. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/GBXUX0871401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb911f549ef40595347e3cf89e2456d673ecc75afae45d71a13ed7e4b8a12c15b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/SEAEO0355020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfb5d1cbc3f46d44c0ff4b7c3caf1a3374c85b93410f39548d2aa42b50fc10e. 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/GBF076111661.
Wayfarin' Stranger - You're No Good - De Profundis - See My Eyes - Crying - Drop, Drop Slow Tears (Arr. Johnson)
A Company of Voices: Conspirare in Concert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644a7ca22ce45e51c04eecc83a4242d96ef3d067cd318d261d0e276b64cec735. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USHM10853407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6037ef5abb951c33302b0f3b0b61af80160987e193c86ba477bdcf6e6a0407. 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/SEAEO0355030.