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 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 0x269c62eabaac42ff63e3af6f58917004844cba1a408d26d96cf0e048a9763c9c. 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/0fa03a2f-5815-439a-b98a-08126741ad53.json and https://artists.proofprofile.net/proofs/artist/0fa03a2f-5815-439a-b98a-08126741ad53.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schoenberg: Notturno for Strings and Harp
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 0x74bcd0d7305f8908b602522e02202f19b540f783f355147c5896de7189827ba4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961902670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bcd0d7305f8908b602522e02202f19b540f783f355147c5896de7189827ba4. 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/DEN961902670.
Recomposed by Max Richter: Vivaldi, the Four Seasons: Spring 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fff5f7d59c7349257b161b07dfe5c0af962578fcbd8e051805defc2bcf22dd0. 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/DEN961600750.
Chanson de Matin, Op. 15 No. 2 (Arr. by Bateman)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42de5a658e38917508cc179a7dbe719b50f6e1830f2e25b14c90457099bd1d0a. 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/DEN961902680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f70d1aa46c557ff726bc8ee850ec229fb997136762f805e9c6e7187ae5854dd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961600730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fff5f7d59c7349257b161b07dfe5c0af962578fcbd8e051805defc2bcf22dd0. 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/DEN961600750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0f9502ab9167de49353db99ce2906c483eea7371fcfda69205db39f52b4336. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961600760.
Dichterliebe, Op. 48: XII. Am leuchtenden Sommermorgen (Arr. by Daniel Hope)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b263725c49ada585e024a2c9888921a00854e6bba57147dc8df7d5a3a1c188. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEN961600790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bcd0d7305f8908b602522e02202f19b540f783f355147c5896de7189827ba4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEN961902670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9230dba886f4c71447c3c9dc025df82d842d90d6d269ba55bd5aa6d74bdbdb. 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/DEN961902650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42de5a658e38917508cc179a7dbe719b50f6e1830f2e25b14c90457099bd1d0a. 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/DEN961902680.