right|thumb|An imaginary portrait by an unknown 19th-century artist Tomás Luis de Victoria (sometimes Italianised as da Vittoria; ) was the most famous Spanish composer of the Renaissance. He stands
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 0xb91d924cf5c91c07d4eda79178da7c71e786d474332d4c36b009ac2e0445f4a7. 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/6ee077cc-7eae-4643-a1d2-d124d11abc49.json and https://artists.proofprofile.net/proofs/artist/6ee077cc-7eae-4643-a1d2-d124d11abc49.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tomás Luis De Victoria: Tenebrae Responsories
Sacred Treasures of Spain: Motets from the Golden Age of Spanish Polyphony
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 0x510f85f2402f90b7aaaa6f5442c0fe56cc377c8a479afa21af5388814a7e3a72. 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/GBAJY2035902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ba6dd86ab1a4c1db3cde197b5852b496883ceeab54eebd1f28db3f5af7b782. 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/GBAJY2035905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526dd44aae251ac37e37317ffe1102850e2c8d83628c44b09ed559fb0bb7874f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBAJY2035907.
Salve Regina: IV. Et Jesum benedictum fructum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff64f82e7ab6de54093d37da9630803d68b71e1bc4089795862c096d5b5e45d. 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/GBAJY2035911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8c5dfed7df3bd500328bbb90fdfaa34e3657027e4fa3e9a1ea12848b05a862. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAJY2035913.
Ave Maria a 4: II. Sancta Maria, mater Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841e3531cef63765db048401acc1c92a9926315f9c8d497766dca0d048c38cdf. 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/GBAJY2035916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c82fce107db38232b52058b94be022389dfada8817b2c11776cc7845a72806. 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/GBAJY2035918.
Ave Maria a 4: I. Ave Maria, gratia plena
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99d627210012d5202a4016abc0fc22c6123d8a6a402828083ad25ea50342615. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBAJY2035915.
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
Ave Maria a 8: I. Ave Maria, gratia plena
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedff4bdf99cfaa5c30f18dc194dd2f0983ee8e58627ad601442837c95dddf208. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBAJY2035917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18de68ae1f561b1f228d979aae66a2cb5ab951250e6a89fd843981c1842a3363. 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/GBAJY2035919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950f5a0efee10efb031288aeaf9da7114aebef6d9419bee0393841f9f70e18a3. 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/ES5232010758.
Victoria: Lamentations of Jeremiah – Ruimonte: De profundis
Feria V In Coena Domini: Lectio prima. Incipit Lamentatio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47aae766a06cb1a93e331bcee16bdab3a336d980b42aaec19f70a750771fdbef. 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/MX2831000031.
Feria V In Coena Domini: Lectio secunda. Vau. Et egressus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6009874ab905bf232aec08e27926c326f888d136ce2f4b2f559ee8cc2d9378. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/MX2831000032.
Feria VI In Passione Domini: Lectio prima. Heth. Cogitavit Dominus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc650ae96606ad0ea9d68a907923e5f699a471a8b53ab8447a26daa67424d24e5. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/MX2831000034.
Feria VI In Passione Domini: Lectio secunda. Lamed. Matribus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48f34ada3fe5939c260439dd11116909abdf02f4dbcd2c470767d6fec37744d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/MX2831000035.
Sabbato Sancto: Lectio prima. Heth. Misericordiae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415ab561ff0da4b868964f63c758a5c091d970bf97a012394683f1d4397aea0e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/MX2831000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc63d3222df48c095f3cae5c95529fb5f384f23ca8ed4ba68abad08fca8b229. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/MX2831000041.
Tomás Luis de Victoria Vol.6: Himnos, motetes y Misa de todos los Santos
O Vos Omnes - Music for Lent and Holy Week
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f14bda6a779c91b2cf1926d00bc5c43b6ce1a83b06c8dc7a4d4eb75d4eae9d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USBZ91300062.
Pater Noster: A Choral Reflection on the Lord's Prayer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382256d767f5467f7762f2b1a8878b34a5e11323efeec945d75b8398eefeb2e7. 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/HKI191245421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920bf67ad223fc47cf34c171f396c832c7de50776061f75a94c45bfb1dde0cef. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEA800003000.
Motet "Quem vidistis, pastores - Dicite, quidnam vidistis"
Veni Domine: Advent & Christmas At The Sistine Chapel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36618ebe2a6c468ad2b529482b17b59b29052ee602a859da6e7148105b53183c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEN961700870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed20cb020d465c9765beb338f5455fb6eebbaa5083665aa64f3f7a4696b1063. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FRX211407001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2feeeeefebb1e8e23bca99bdaa2e354458df980d4c90ff667845fd872002b539. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FRX211407008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4789721ba8d00350be5f57682a89b93426ce244867a431f94424269e9dc63c. 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/DEN961700910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa17e110ac328a55aab072e50b8fe72d8d6d00716d5ed322900e6b44c7c978ef. 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/ES7890500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1097441a2a134ca3e9777caa65c06e037c5a08985fe891e1fe69ce5b610292b6. 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/ES7890500203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa965bac61ce59957a1f436ddbc2a6d4f6763139fe6befe20b356057d7ebd85c4. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/ES7890500208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee657ebcfb42caf49dab3c089e4cc49a13b812b5232ce47f479acf4c8a36240c. 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/USZDG0600154.