thumb|Portrait of Johann Heinrich Schmelzer Johann Heinrich Schmelzer (c. 1620–1623between 29 February and 20 March 1680) was an Austrian composer and violinist of the middle Baroque era. Almost noth
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6147489a0774e74a18c0fc8e4b1b0890c6e857e3667742b04a96e5bcf6c9d4b6. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7dec9f9-3e34-4864-aec4-1a780e68a0cd.json and https://artists.proofprofile.net/proofs/artist/f7dec9f9-3e34-4864-aec4-1a780e68a0cd.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74430a9a63013e7f0c06d807389fbfb8be5922dc3668b90f3a9f3d2f30d21668. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CH1492243601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cdbb3155648f1dc68e0ba592ac3abc5ac0e796df6c5fbc22fdfb08620d7165. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH1492243606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e6080a59684bb60c1f79b36638e090cc44eecee243525c3117e2b2083229dc. 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/CH1492243602.
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 0x2d864da92eb17322c81a86daad1454f5df00f387dbdc0b090504473ec8509533. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CH1492243607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1feb6b0d52e2e95bd418b6a4e9f58cad9d4cf6148a1cf3b8335ab60ccbfd9cf3. 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/FR50X0510901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6b4e83079587086e100351acc3d429cefd25ddf240b419a2cbdce048971114. 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/FR50X0510904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028a6b232645e320f9333556567df2a0835c41abc90463f2b230c020a072a61d. 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/FR50X0510906.
Sonate in B-Flat Major: II. Presto e adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d63789d50beae989770e0575fdc0c52317c257cb00e7ba5313e2249e2455b9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR50X0510908.
Sonate in B-Flat Major: III. Fantaisie sur une basse obstinée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a00f965f8259520557334df420b110927d18ff2ba814a32a2988f9bb9e30d4. 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/FR50X0510909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044fa9ae408e9e7fa6ad6aa9f5621c8d3bdcd17cef829343ec1ef3b6dfe622fb. 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/FR50X0510912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a0fd271ccb931a5139e291a80700843b4ee5df22a9c3b672bab1929eed1ff. 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/FR50X0510915.
Sonata quarta in D Major: V. Adagio e recitativo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f6bd616179b75f4a16027add7814e5bec1737f851007b5f820b2fff982f7cb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR50X0510916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9da816d0d10c2ca3cf8f28bd3e083d7a2bd3f7f821b6a4c61a802cfb13a202. 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/FR50X0510921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa581601442b754aeb2bb5e8a3e66737b305e791421451b54459539ca6121f3c8. 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/FR50X0510923.
Sonata quinta in C Minor: IV. Aria e recitativo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bc1d59b88089a5b8c0262c3b2a0d788f983b9fffd5ae1d909c2a33580a2895. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR50X0510928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb05ae226b272aa896051e0bb663f27afc905fdb959f91cd9098c1f65d44746. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR50X0510929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7029451bb7c57454d5d9519bf68a8b4678d9817bd42e6a59e7993fb34a0c398a. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FR50X0510902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36609416f7f504edb71819a63eb02b28d383f4f7f871c73396f409470a084ca9. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FR50X0510903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e0377aa6a23679a97d4a305770b0f59a158a7f081524fbb4aba2fa5b2dd523. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FR50X0510905.
Sonate in B-Flat Major: I. Grave (e recitativo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c87cf549d98a355784c29968674c1b5e20943968f39b028611d1f0c22e1fc5. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FR50X0510907.
Sonate in B-Flat Major: IV. Grave e Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037f6d35a0f415cc15011fe77115710590900802a920f0686dbfaffd13631d30. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR50X0510910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299e80b2e56a43f3ce0374a4d880c91d46384b940b59f18fb847e922c38ffc8f. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/FR50X0510913.
Sonata quarta in D Major: III. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f7e18c3f3230cdfc56a82fbe463ad2997c9def220815925e76503cf4ac25f5. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FR50X0510914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec66b090717600cbb28bc3ab559f3c3571b57d7278ff8250785485d06145b8fa. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR50X0510917.
Gigue dite Pfefferstossl a violino solo senza basso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5763144fb5a0a323c2a8a774496bfcf928568d56934300483943e5eaebc5d334. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR50X0510918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ab4a0ea8f9a2190fb01e336641381667fde1fce4e857cb08e8dfa22dfc5145. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR50X0510919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a2b56b654be11b3c57f0440e5fa40efc5ca920cadc826354ce6775cfe39a59. 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/FR50X0510920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca00fc5f11f64b2c19935de8cb54863eaf9ae877b089e2a03673b53365f8733. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR50X0510922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b888aed99282041af0e7680ee8e890ea2589128ebb660d639ab087589a1959. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR50X0510925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8921f20a6a01ed00b2ecee07ae2903230ceb8242a66a6ea8bde65da679b14c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR50X0510926.
Sonata quinta in C Minor: III. Adagio e recitativo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61645985b3f95dfbe8fa8965ea73d89577e3f687e169d77ae6c82984b30634e. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FR50X0510927.
Sonata quinta in C Minor: VI. Recitativo - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13575627eaf67dc96a1dd2f33900b8e8f2b4be6f90f55a36a4e0c9d859784efb. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FR50X0510930.