thumb|Title page of Franz Rigler's "Three Rondos" (1790) thumb|First page of the manuscript for Mozart's Adagio and Rondo for glass harmonica, flute, oboe, viola and cello The rondo or rondeau is a mu
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 0xc1fa309c6a61c428ee905e01bb4db8f82f54c4b99fb782718697cf0e64549091. 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/cd804b76-48c0-46a0-85c5-f38b8b66975a.json and https://artists.proofprofile.net/proofs/artist/cd804b76-48c0-46a0-85c5-f38b8b66975a.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 0xf22d396294287b8f3cc6e292940a7275428b13c51f7f19f79efee33ace325906. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GBRKQ2267339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c633852a6be51233bbb1d0f86618092e026b22b535916e626ceb699815ce94. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/LTE209600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c54d3a2fed195e9974f747f6241daf2e0f697be1b1e2c35d0ab4df48ab77462. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/GBRKQ2251204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd176dcc2e1286df6c0557c1d7ac4d45a1fbd1682cbbdf9a6e750b43f25ce1c81. 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/USLZJ1822776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7beedbe4977db13157c951dce32fd068443b5b95166166f98d4934fc2e35ef52. 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/GBRKQ2241247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85453442c63739e4f0be179a9d30daf4682e8535899906f3d32421f597d56834. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBRKQ2252473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2335279394607637ae052693f3fe958016b31895b37e9bae835c3143194d867. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/GBRKQ2252491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f91506edcbe9c10a0a2d81d16f26b7e1651455886eae13e03a83f57666fead. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZTRX2369175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e60143b357046b693ef68a3721abe112bc33a1ae2df402c426517e96501317f. 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/QZWDD2336695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc90f7815a4d836781ebe2c6a1f718e400f11e72406e18a172c0f05903de153e. 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/QZZ8B2325181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4490832def9999c731c51aee4ccabf488899fa4f365dc6bfea55bf9315034a. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/GBRKQ2427840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827a1abd093b92248cae03c0f4ea19fcb37955d97024a146f70e2f75e3cda565. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZZ8A2459428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4686bace91b9f935f4df10722c04d4086e20365e8dd0371cdff75d97decc50. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZZ8A2473939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6a0a334f27cd2882099e133f21449d3af4ec091da7b7b224fe0071017eba9f. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/QZZEB2492764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f3ecfc4e1995010632bc36fff2a3f23581662e8905ed3e6c1251640a6aec05. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/JP92A2505909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93511f279984d388a8ed4357d5e9dda92949483aae77415690a357726abe188. 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/QZZ8A2545173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9082ddbb64e3cc6b8ccd33c9d321c5e2fd529adbc8a57d96ca78449866259f5e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/JPZ732500330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb85344d82f5c3f1d324864bac8992549e0e45beef253b36acf44b5d8d3208b3. 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/QZRP42246554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9493798701f59bc9a4eb370e8095859006ad0973d15c559a3efc59449a14e6. 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/QZFYW1929483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32090f35c915f705276397dd4741450dc0954e97094445079e6b906486d51305. 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/LTA702400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd176dcc2e1286df6c0557c1d7ac4d45a1fbd1682cbbdf9a6e750b43f25ce1c81. 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/USLZJ1822776.