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 0x88abe9f2c36f816902d1eb3371d39711ac650980e71ce00eb8af5e3972abd5b9. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4981b0ef-b331-453d-9f47-b8aa33851bc3.json and https://artists.proofprofile.net/proofs/artist/4981b0ef-b331-453d-9f47-b8aa33851bc3.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04c39efd87e7c888a0b082f6f2b473528e8f0a952c098d07681db7ee216df16. 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/HKI192244101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a2ca06a8ea3589f8e746a86e83aa89e8ae1c080bbd82bd7a1df18aa35a455e. 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/HKI192244102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cf760e3d38c88d6c8d07f76f72e11fd502197b20827a04fccb4069558a2e64. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKI192244106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b58abf1c0dc13b5043ad4a6d12865b2ed861a03870b2d27291daa5fcf56376. 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/HKI192244108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f494591593047a06054f7281d95982c5954d35da1f882d3c0c6112cbd94c9ec. 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/HKI192244109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28b416560c82170749d699e1a8b627b0b5fbb5d4079b0389178bf22593f127b. 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/HKI192244110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3f2174c512fe936c850ebbf58539ecded330592a7677f5d5293a0a80ddb55e. 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/HKI192244111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c10cd27d1cba76f7e59026099cc701e8c031915daece9d75968f479eb6e1f4. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/HKI192244103.
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 0xc6037d27a0aa7567d876a29e0748a91e3728d8b4965682e194a876591c16b7d0. 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/HKI192244104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea5c4d4d71b666ca9f7caf16785f397c437b875fe41582dbc5fcf9c6bf7fabb. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HKI192244105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e0165b7e0d009c38b8ea9ff81c982a101d3368500d45cf7686f6da610461c5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HKI192244107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b1be543fd0a61c41074d863cd02f5400cec0896c129a3d7a335ab1368ff7f1. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKI192244112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9320634e4f297e7e5af163575f5447ee6d23870d9dbb1e6d55d05ee7ab0b7dc0. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/HKI192244115.
Rodrigo: Fantasía para un gentilhombre & Concierto de Aranjuez
Fantasía para un gentilhombre: III. Danza de las hachas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a1f53747610f227ac87e0bbb73fb771c45c2f3f54bfd8fdc15841f10eb4c8e. 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/ES59G2030403.
Fantasía para un gentilhombre: IV. Canario
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6873ec75482e39011664ea36234a1cc08989a71cf28449f3f242d1de56e035. 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/ES59G2030404.
Fantasía para un gentilhombre: I. Villano y ricercar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d487b04b78029a75d063ffd7daeeb8254f84ca747857e6100459f63333eb49e. 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/ES59G2030401.
Fantasía para un gentilhombre: II. Españoleta y fanfarria de la caballería de Nápoles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ebfa3a787d4922b9adc18bd39390fa5e30b6a8c5a8cf55abeaad1b5549445b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ES59G2030402.
Concierto de Aranjuez: I. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546b974d607c0f3b3a2a3fbffdb5acd3944175f934a6505cb076ae55bb4420b7. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES59G2030405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c61fecde53d6c432ab5ccb569f7b3add4cb249016ac3f8bb2ddd9a5c35b91d. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/ES59G2030406.
Scarlatti, Tárrega, Sor, Malats, Albéniz, Piazzolla, Coste & Berkeley: Works for Guitar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07224b4565f12dd58910aeea91cef30f8d21c0b483c41bcfcb08853bc32941c. 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/HKI191708803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30f38f58bc45757f2bc431d1a541fe842851684c34eac531c246c66ebd0d509. 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/HKI191708805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fbb94d02cc2f9bb334b25b3d28717506b18c4488a1fb142f227c4dcfcc7be1. 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/HKI191708807.
Impresiones de España: No. 2, Serenata española (Arr. E. Thorlaksson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da5fdc8d7db4aee3c1f4f65b0a124086386d28c536cd4d000f41e63767f9498. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKI191708808.
Sérgio Assad, Leo Brouwer & Roberto Sierra: Latin Guitar Sonatas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b77de1ad41515191ab04e37eb13e545a746a974262f983710b8629dc3d0e3e. 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/HKI192135010.