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 0xc082994704f4f35464f214f4551a2a98ed6a2cadb3566ef70a376d18380ab161. 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/f0f9c4b1-81fb-4b6d-9cdd-d065c37a079a.json and https://artists.proofprofile.net/proofs/artist/f0f9c4b1-81fb-4b6d-9cdd-d065c37a079a.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 0x06d096fa01beeacab045a8364fdcd0662759addd148e804a86e57f2a68b53f58. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USX9P2024423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09573c52d7259fc68c1c3ab743c575539558f93bf4de38224a241c156db515ef. 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/USX9P2024430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a0672186d5a1a6f92bddabf7098f8d83f715e4f3d54ff0fc95423aa9f0b812. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USX9P2024428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd476ebbb1d1a6be54b4ac375d0a3016d9818f9b86cc1a030fd8f24b736f67c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DEZC62159258.
Piano Sonata No. 8 In C Minor, Op. 13: 2. Adagio cantabile ''Pathétique''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58c2f899ec38aeb3a6ad0a1884a2e16cb48f0bdd5217e5ddf4cb5c5fefa90f0. 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/DEZC62159260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd440f275b839ba1d78e9ef14623f7d4cc98918dbcd4e32b488c8c64cf3d2d582. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEZC62159261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180560d27053d8af373634dcdf51ea7a3b4653bef1b3e149c221bdb0e9eba37b. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DEZC62159240.
Piano Sonata In F Major, KV332: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4c2283902d840a31e7756697a2d0de042a42622795bac9fef7e6046a0ca171. 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/DEZC62159242.
Suite No. 3 In D Major, BWV 1068: 2. Air
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69819204065c04cc3c8463b4ab3b6b6fa05a6877f1d5c65aa3af5b59bad42aef. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEZC62159243.
6 Consolations, S. 172: No. 2 in E Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75192e063dfccda3d453fa6b2f6e956d98b6c957e99a8fb5d1f890723dbe9e87. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/DEZC62159248.
Kinderszenen, Op. 15: 13. Der Dichter Spricht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16abf6a2854f75686d220393d8eeab239225c8445da6bf27b500db5372e83e0c. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/DEZC62159250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6789027921f88562da83617411a1d59010f82985f6b61ac966395d7c41a85a4. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/DEZC62159251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b289258f547e51b9b9136e8b6f1f9ebd57bca6d15c5f15e66c495f83eaf0906. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/DEZC62159252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6ae808390d3e521189dfdf22042f7a52228e29787ed01a201b99517cc02d3e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEZC62159256.
Piano Variations In G Major, WoO 70: Theme. ''Nel Cor Più Non Mi Sento''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b753d833038a28a8d99093a65434095d74d38014c0c0495101b94e53968c0e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DEZC62159263.