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 0x6e983a5cdd5842f139e398da85321aa2474a5dba07e7ac4e5895dba1347a8e91. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38640345-f8ef-4aba-ab9a-6041e32d8246.json and https://artists.proofprofile.net/proofs/artist/38640345-f8ef-4aba-ab9a-6041e32d8246.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Württembergische Philharmonie Reutlingen
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 0x72877692f9eeac8343ec046ed8af6fb40a241d490d728e9da0c10b9fbb46dbfb. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031901 — a six-check JSON result.
La cambiale di matrimonio: Scene 2: Cavatina: Chi mai trova il dritto, il fondo (Mill)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6304489853ff9be4ea3f4d5abd6581ffa0abc1d4f173e20e601ad183b88f2afb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031903 — a six-check JSON result.
La cambiale di matrimonio: Scene 2: Stretta dell'introduzione: Ecco una lettera per voi, signore (Norton, Clarina, Mill)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4223c99c7c2659892b164dcc42b39345b554eafc1b4ff8927f6e50c26a8648. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031904 — a six-check JSON result.
La cambiale di matrimonio: Scene 2: Recitativo: Ma, signore, questa lettera (Norton, Mill, Clarina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131b6d9ea25e1d7e4b27d334f761aa20e9e862b33194cdbf2deeb2640ff34175. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031905 — a six-check JSON result.
La cambiale di matrimonio: Scene 3: Duetto: Tornami a dir che m'ami (Edoardo, Fanny)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1371ca3741113edaaa1bb6cbc0470fdd0f9d9c3df2a7551cf4eec06656cce081. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031906 — a six-check JSON result.
La cambiale di matrimonio: Scene 3: Recitativo: Si, cara mia, speriam: fra pochi giorni (Edoardo, Fanny) - Scene 4: Avete voi veduto (Norton, Fanny) - Scene 5: Presto, presto (Mill, Fanny, Ed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56e7389f14396373620190284c15dfdeca6ac0566bd0fdfd606721a53359e2c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031907 — a six-check JSON result.
La cambiale di matrimonio: Scene 6: Cavatina: Grazie … grazie … (Slook, Fanny, Clarina, Edoardo, Mill)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29f119f91eceb2cec14479c362d3e3e99bd648836375a1dd3991319d697649b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031908 — a six-check JSON result.
La cambiale di matrimonio: Scene 6: Recitativo: Sicche dunque istruitemi (Slook, Fanny, Mill, Edoardo, Norton) - Scene 7: Servo! (Slook, Fanny)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979f07fecd4970e90b767e5ad2160fb13edf4f1f3e4591dde19fa166366dd201. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031909 — a six-check JSON result.
La cambiale di matrimonio: Scene 7: Duetto: Darei per si bel fondo (Slook, Fanny)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9383d3eb1b5ba489e377be3011f32567db3e54bbc82d3e8c209e5f3448d82f9e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031910 — a six-check JSON result.
La cambiale di matrimonio: Scene 8: Terzetto: Quell'amabile visino (Edoardo, Slook, Fanny)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af64543729bd8b85bd64e7b1867ec2c8ab8e0614a3b7d572817ef43c2b5be3c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031911 — a six-check JSON result.
La cambiale di matrimonio: Scene 9: Aria: Anch'io son giovine (Clarina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ffbfbbc0d148834880fffd4e30a0271723b2e67cace02b44a20040a78139d9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031913 — a six-check JSON result.
La cambiale di matrimonio: Scene 11: Dite presto, dove sta (Mill, Slook)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5607b97fc86652ffcf3fc9b83b77a5b70f876ed9624ccdc004002ab682e9a7e8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031915 — a six-check JSON result.
La cambiale di matrimonio: Scene 12: Recitativo: Venite, sono andati (Clarina, Fanny, Edoardo) - Scene 13: Bravi! (Slook, Fanny, Edoardo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dceb998671b46b78bdf6a887204d1bd2a5cdfb6cb52c6858107f78ff3f7cda. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031916 — a six-check JSON result.
La cambiale di matrimonio: Scene 13: Aria: Come tacer, come frenare i moti (Fanny)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47723defc760ee17f97f08577966640bdacf5e26a04475008e3ee75996936629. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031917 — a six-check JSON result.
La cambiale di matrimonio: Scene 14: Finale: Portero cosi il cappello (Mill, Slook) - Scene 15: Qual ira, oh ciel, v'accende (Fanny, Mill, Clarina, Slook)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9105e1ac63238cf9cd6b7dd2024763dbab691137a78f4d6e5928f36ff7dfec18. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031919 — a six-check JSON result.
La cambiale di matrimonio: Final Scene: Vi prego (Edoardo, Mill, Slook, Clarina, Fanny, Norton)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d739109255ced6626f579667f135c50a68f70e0b281a73754e982b4aef15da. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191031920 — a six-check JSON result.