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 0x11384d8e6aba5ea41b80230f4b5077e541d2cd615503320733f6dca73fd847ea. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/40d1d97f-3b7a-48fc-be67-62043d7f4fca.json and https://artists.proofprofile.net/proofs/artist/40d1d97f-3b7a-48fc-be67-62043d7f4fca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sofia Gubaidulina: Works for Cello & Accordion
Seven Words for Cello, Accordion & Strings: I. Father, Forgive Them, for They Know Not What They Do
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 0x00e1872e27502bb57250ae021b5b78ffaec30cc60c1995f254ed1fa01a46750a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/PLE442140001.
Seven Words for Cello, Accordion & Strings: III. Verily, I Say unto Thee – Today Shalt Thou Be with Me in Paradise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacdbb5f3e6ab4de7b31239bb220f67346d32b5e091d410db222aea6e0328e83. 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/PLE442140003.
Seven Words for Cello, Accordion & Strings: VI. It Is Accomplished
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5dd6809a253893d8ad5c3f7f687f779a5286bdc3c25cea90ac5f355fd7111f. 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/PLE442140006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58de06e66e4feff499d3d344933fad3d0ba58f9173462105961eb27737ea298. 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/PLE442140008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34201ecb2b253635fef8a66c63bf82ffa09bbd5bfd182b8e5c8b6d942d2ec158. 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/PLE442140009.
Seven Words for Cello, Accordion & Strings: II. Woman, Behold Thy Son. Son, Behold Thy Mather
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7f9d6dd7c1d75990dc9b58646acb0a7c25edf1aa2d11287ea4e80271a34d78. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PLE442140002.
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
Seven Words for Cello, Accordion & Strings: IV. My God, My God, Why Hast Thou Forsaken Me?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0088c85cb30bc1e035a3190c96f94b4e4b55e70ec8d7084a9067fee63b4bb7f9. 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/PLE442140004.
Seven Words for Cello, Accordion & Strings: V. I Thirst
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac37f0488d05d02e1ab07cf3ff0214dee86a51ef408fc5ef8014530219008d3. 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/PLE442140005.
Seven Words for Cello, Accordion & Strings: VII. Father, into Thy Hands I Comment My Spirit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3788477ea5d4de14f45613ad725c7f24ad15c2082ee20448b8dd46de514ee30. 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/PLE442140007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adafe111ba84baf649c721f86e6a6fd7a920f886d9e74e19cb4ad332dd9bf32. 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/ES59G2431303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7c1cf5a42ac47c5275214212ec099a3c66e469302dd1624e06a08520413397. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ES59G2431304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5e807cd562f7cacd5c7feda88f0633d22ebb54bcdb7297ed7cda941e98ab3d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ES59G2431306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9503fd716c6db0bdca0431f7537d4df158331ed441808a3f2c60594700e8b6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ES59G2431309.