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 0x76894351c25d9f3d0bff7aa332b2f2a0c80db01129e067218f9e9be4b85e6214. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cf0e5cc-5813-4b81-9f02-4356d2d35436.json and https://artists.proofprofile.net/proofs/artist/0cf0e5cc-5813-4b81-9f02-4356d2d35436.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sor: 24 Exercises, Op. 35 / Pieces De Societe, Op. 33
24 Studies, Op. 35, "Exercises": No. 4 in G Major
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 0x7092185f63e51ddd5a734d3bf7353d346fcbdb3d99d42274559b8eb89ac15cdd. 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/HKI199507608.
24 Studies, Op. 35, "Exercises": No. 7 in E Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce2b9b5ce4ce1e353080d9ec37a23a437658b4ab2eb65b170e4963718f3ada2. 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/HKI199507611.
24 Studies, Op. 35, "Exercises": No. 8 in E Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abfb5e6aa310de4d452259734d06cfd861aa7e8f05d362c639d3b905d3f5067. 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/HKI199507612.
24 Studies, Op. 35, "Exercises": No. 17 in D Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06c292a4207349398ce7042ee97a872353a67a0a6d77f6464f638409b9423fd. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/HKI199507621.
3 Salon Pieces, Op. 33, "Pieces de Societe": No. 3. March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc18656c39261d21053462a587a6f87df68219ae02fcd7c67968e57cf8c93697. 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/HKI199507604.
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
24 Studies, Op. 35, "Exercises": No. 1 in C Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fe10ab16c16d8d2a3e04daa23276ba362e7a85f3918a72de30f5083ff86b4d. 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/HKI199507605.
24 Studies, Op. 35, "Exercises": No. 3 in A Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b05bfc95f267733d7b62d74bc9a53ed8df47c2df269304b29b60646919812a. 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/HKI199507607.
24 Studies, Op. 35, "Exercises": No. 5 in G Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcf0f3a0d59f2f3347c4731c5cdfeb48daff517b3b8f36ff926c17de5c61759. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKI199507609.
24 Studies, Op. 35, "Exercises": No. 6 in D Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cb190b0a9874ffd078ee9b37da30f921abc8a37b84121672d0caafe84c368d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKI199507610.
24 Studies, Op. 35, "Exercises": No. 9 in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae18d2c3cd67b641c811e39c7ba62ce6d1f0199cdfa4716618713ad44e3576aa. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HKI199507613.
24 Studies, Op. 35, "Exercises": No. 10 in F Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e72a1772430e1601772fdb758bdc22f38287f3dd2c481659f87eed996214f34. 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/HKI199507614.
24 Studies, Op. 35, "Exercises": No. 11 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd81f1c2ee1ad3c078cd87a406af444228b2d9d7700fbafd5eaffc7848e7bf4. 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/HKI199507615.
24 Studies, Op. 35, "Exercises": No. 12 in F Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c06b17d38383856d0ac5e9363a77712aa097056a684c2149dae3095f84e55d. 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/HKI199507616.
24 Studies, Op. 35, "Exercises": No. 13 in C Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5f2abe87a551a2b1725fe041208bf169f6a4a64f07d9c06f90634d8b7ba70a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HKI199507617.
24 Studies, Op. 35, "Exercises": No. 14 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d3c124b69dfd1bb5af9b6ff804fd30523736515bd94afcdad82d8c0bbf9027. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/HKI199507618.
24 Studies, Op. 35, "Exercises": No. 15 in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cade5d2d964b4d31da4c02afefb73a2aaff2c5e258fba7254d21f85adc8f569. 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/HKI199507619.
24 Studies, Op. 35, "Exercises": No. 16 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07141145451e6208f0ef9b95d880c9f906cb62fbe9f12024b43ccff3ef5fc039. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HKI199507620.
24 Studies, Op. 35, "Exercises": No. 18 in E Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07371068cbab07c6c586e25c55fcef8c5354aff41d4d1c271bc0455661a9dde. 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/HKI199507622.
24 Studies, Op. 35, "Exercises": No. 22 in E Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45e5da0831bbacf18612385bad0a71dcff4760e19ee55d4fd1da0ef78003ddf. 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/HKI199507626.