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 0x0cb50a99ad78636563a3b05a2a159830028920a5d82ee269e22b11e3081edc7e. 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/403eaee3-2d5d-403c-a23f-e18c612aed61.json and https://artists.proofprofile.net/proofs/artist/403eaee3-2d5d-403c-a23f-e18c612aed61.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 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 0x4dc9d425636c5ec9a1805a0f4f9a012ee127fefe27cffa6ced7086313f7d6301. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNA2160384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98034edbbbfac0ac16b174ce924a787d4dcba991506bff9a5974c59c8bd5ae0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHNA2160385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd9431b350d6ff18b80f7a9247551a2f81a8cd88c5378df246b91a8a20044a8. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHNA2160387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b63dbec0f6121f2fb087de7d96ac01046ddbee6b9c6e2daaeb55f99837b647. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHNA2160389.
Scriabin's Prelude in Em (Opus 11 No. 4)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c61b69914088a2556417cb56891fac88f6fa643c633c6739d095cab0ba2e87. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZHNA2160391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed5ba5e576ca12fe644d8896d6248373b00877764fab0edcb1cd95de75879c7. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHNA2160394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942d910e9e5344e90c157d865a2dda1eca1076d5902528ef3eb5d0133459c6c8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNA2160396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8902994036a2a7b231c6c0ba4f5fe0616b44aa1b0296c3044121820b4f80989e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMER2133484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0da19ed890844caa699fa12b0681d613469b95a18107f41c16bb2a397aada5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMER2133489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3701481491f269d8dcd9e0deb338d57f4b07c9c1c72cec9adad67acfd1e0e23. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZMER2133490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356b399b580fb20c08c85df1faaaadd082615943322b36025c35f60c2d534e6f. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZMER2133491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4a62e6eac5c7ccdc67e1edd5cc473acb1153bdac2bae746d71f686bbdf3a68. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZPLR2189960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71562ffc9f3c3498596d0b6a8a6c3c937b2dadad03d08cdfaca32f220df958e4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZPLR2189966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78dd807ea41b7f7692af9984bb4c68cae96f68da829a99bc0154d560f686ced. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZPLR2189967.
Schumann's Träumerei (Kinderszenen No. 7)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd4b74df53a4fe69a35fb2fe70f5cd1cc7b05b9f6d175882066eef381b9daf6. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZPLR2189972.