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 0xff5fd786d6b218112648b6f6236e0820435bceaeb6e3421c76da15953afdd58b. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c858011b-6315-455e-8af8-63ee629531a4.json and https://artists.proofprofile.net/proofs/artist/c858011b-6315-455e-8af8-63ee629531a4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Walzerkönige - Anthologie des Wiener Walzers
Die Walzerkönige 2 (Arr. for String Quartet)
Ensemble Wien Play Mozart & J. Strauss II (Arr. for String Quartet, Tokyo, Live 2013)
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 0xc4cc89d860d4e33cb605301fb48cb765d9bdd9605b92cb46e6af7f8fec57c421. 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/ATM891302089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d00cd51e2b22bb454d37713837e9cda9af72eaf61a65270027c93cddeceec42. 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/ATM891302092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1324f39f0ef820e6239497cec9e901a191c6b51247eac96db6ec69ec1134a9f. 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/ATM891302093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5061c8fb86fb6cdb92b6045cf9f0d724c0122670a98bec2fe91a113aa18087e. 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/ATM891302096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c96522b895e71e8be0bf52c61a88043146163746c53d41639d0eac7dffa2a4. 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/ATM891302100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf64f1ea8f4f7f2fe08b482ac3b23dfc66056bb6f715b59cd23f0b1ac4ad5601. 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/ATM891302101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5339b7c9ef204a6b4a466d6d2544d95e08dc791394a2fb458430075128996ed2. 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/ATM891302103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6de9217489199750d9eaac9e264fdf26fc75440deb4889fa7ec6f27a2f0948. 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/ATM891302104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045e63f73159ed2ba1ba1a8f8444c04799314088d8df822f48596686992a0181. 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/ATM891302106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a313a94ad6e3625b590ba96a44a712874e067bab41106149590a6f37bac353. 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/ATM891302109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67012f4be995b6285d5af4ae8ae2e8bbc20f5271892129c4444b28db92f1820a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ATM891302111.