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 0x03a8e2c25129e5ac0315863168867d4fcdd6f01b8a4b3038a9c0a19b0fec8513. 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/d0c167e1-8c4a-4866-837b-9c158f33b9f2.json and https://artists.proofprofile.net/proofs/artist/d0c167e1-8c4a-4866-837b-9c158f33b9f2.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 0x35d271e330b9c84ec50edf541cf4090f6a4b1790b44b2f0c606dbfb16cb5c268. 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/QZRP42320837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72efa1e3e593901aad60bcfb527131bcdfe7c9a17e14d10c387460133bff8e53. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZRP42320839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565233fefac8e4e74b7317a528c441eb4ac8fc6daf9fe43a9f725da663f4925c. 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/QZRP42320840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3857276c777528096af4ed31250f43e0c99790c4dce86abdf2f12701f74a51e8. 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/QZRP42320841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc069df582b6786bd5bb600c18a41c987f913c3185c5d2b15ff34a058a1ee9c3f. 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/QZRP42320842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456243d7a78116d6b15dff139fe732dffdea6faf24f89af9e9855ddee15ee0bf. 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/ITO101123871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53100a650b49a9e49b34174a62d521d363f495aeb8c5fcb20072bac2b8819605. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ITO101123872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cb74e87e972a6a321d71ab24163efd3844ab5e31999fa28adf11171533761c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ITO101123874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fef62aab6c54f277cd147c35a213c585ccbed5ca88b19d5a42cb5abacbec42. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITO101123881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aaab7128ac8341bfa9d825450cce984a56c89acdb2265f325ffd5a6d64cc6c9. 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/ITO101123882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c439fff68f2964cb150d93b42f9afaa91aae8e0c97c9bfc74614fb0e556667d. 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/ITO101123886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f3f0a03ffc05fcc6347a3f59f85f1b5acb109508d88bde575e7c88d6786aa1. 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/ITO101123890.
Johann Sebastian Bach - Book 1 - Fugue 14 with Relaxing Nature Sounds
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab9ce0c3ff9e5518dc5dcf5b8e38a4a9d9fedaddd6996315c00ca1952893b53. 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/ITO101123893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404373f71a944cd923b2dd35cd193f5b49e633012d95dfbeb610aa47985dd6e1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITO101123896.
Grieg - In the Hall of the Mountain King
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b546c2fac2507a191788da89c07bd2513fd268c4ecc9f3a9a32ba99cb94946. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITO101123902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf3d5ffe1cb4baaed2d0cdd03b39cb7a05617576d8c62ce415396646003a671. 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/ITO101123903.
モーツァルト - Sonata No. 16 C major (Sonata facile) , KV 545 (1788) 1 allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb3027ecb83b50a9ed7aa18fb4effb5b283d86be7433ec9fd1b6c25a889231d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITO101123904.
Johann Sebastian Bach - Book 1 - Fugue 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e63b7d104074201ad9444c47aecd5cacf2e54c7baf464e6d35bb6b0c136052. 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/ITO101123905.
Johann Sebastian Bach - Book 1 - Fugue 02
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df76f6d64c3cff73b25d19587889ea98e5111a09de5a388172d35df4e04c942. 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/ITO101123908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36f96cd3614b77d08cd56fc4a231d4bb339935d122b3c12b8c2dd7712a57819. 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/ITO101123909.