Tosca is an opera in three acts by Giacomo Puccini to an Italian libretto by Luigi Illica and Giuseppe Giacosa. It premiered at the Teatro Costanzi in Rome on 14 January 1900. The work, based on Victo
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 0x25fe3b7516634d757538ff0545bdd5cc530b9b985e0535e66263e9a8a06285b3. 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/e170badf-a692-4d0c-bf98-d4de77edd0eb.json and https://artists.proofprofile.net/proofs/artist/e170badf-a692-4d0c-bf98-d4de77edd0eb.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 0x54699b22ea8580bd22bbd034b90671f45d808c4174b7124993205fc42250a990. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/RUA1H2002632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6e3cf11950c757e81278efeb288506a56404aed0219ad78e32784983176f89. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/RUA1H1927444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644159b72a9e22e77fd20f81f1834c363817b1d00a3675279051a79c42c16e63. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:50:29Z), 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/CA5KR2143219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99096b5ef938e9649ee091201d72dfbe0d44033d12ae9318097b371369210b87. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/CA5KR2177561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76529ce8feccbcbc4bad48a072cf73f316f480856971eb5b98d6f2c02a05e1ea. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CA5KR2133064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568449e87aa22085e5803aaccb057a1a125fe0a5f719dc1ebdff0cee293c5167. 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/CA5KR2173429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b5e68a674e799434dc135ae3f0ed65b059b5d5e2d111ae8c2a41aaf5730b38. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T08:21:46Z), 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/CA5KR2185980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b5d7deeabf3e5ed4a66ed4812836c84dbb365c9fb40f1917bb09a57904442c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:28:28Z), 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/CA5KR2198448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5c28547e366759bd7664cb9af369820cdbbb8d54dff7064a9d54c681cb33b0. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/CA5KR0012665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75e40b39de7f19013dbbbb39bbb56f21a3cd8a588f0c6a83edb023f0882d7b1. 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/CA5KR2203268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81b70ccb1ae87c574dc1676124acc6652d5f62e3633939ef27e40289331c08c. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/CA5KR2294856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81d1a22da35c5aadc2564c736c24338f7a4bb729cf06c32f9b64e16b27db846. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/CA5KR2396050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1970fd376f47f5bcaaf12b097a301bdc4183effdcee3c14241af311edb4fb7db. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:46:59Z), 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/CA5KR2425581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3695d672828f432aa288ee39a5255dd78ad28bc941618c45ae56f0dbd99cd25. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR2388701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81b70ccb1ae87c574dc1676124acc6652d5f62e3633939ef27e40289331c08c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CA5KR2294856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbda5ef425e8e4c86603aa0c20345415611410ea87ca20336887a73483551969. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CA5KR2458393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e6c078e2d0d8ad0b1c822287618e3460f6de58b8e7e0c103ed86e343a38462. 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/CA5KR2482391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9626147ce7b206f95d4d9daa3c782ac00f2a043844ee8f8cb641df0be2fd5a48. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZG2X2402936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8a1faadba58bbf04a27da50a0fe367f4809d7cb9d74ffe407a735e113bf3ad. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZG2X2407413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa483bd1ac59cf69d435426d605ae4c95c1f9e6a5e5597dd68baef2f8d5b7cb8. 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/QZG2X2410089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b1218cc333f60f770c618be0215e12fe81bc7237d2f9c5e63a74e1f6e01e26. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:30:56Z), 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/QZG2X2413333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c96d8ab574429be77f8b4a09f0116701038ff43d397803dbee0749297304166. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:30:40Z), 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/QZG2X2417266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9007cf3ba4befe7cfe06a27a2b811f7f5065c19baf702e3c57521257a1efb027. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZG2X2419340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99819fb051f6f6d9e0bd2e253fe06d00869a8735945d03b66d4afad7fb690b8. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:19:25Z), 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/QZG2X2422267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c266010a197c1248dfd96a98d6dd80f74733f2feceb646fe9ce2821e8fd8316. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZG2X2500831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e452693ff825248ad007c1f28dedbcffb877c2225cec74f8ecd9ec608dfcf47. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZZ8A2527953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e510b8c3d65337124ac3e5a0a6e20994c1b13cab68a31bb2b1ac0463f0b050. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZG2X2505925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8b3372df0e29b6922d32685612e7de419e5b0dd7b77092948eb7e322877778. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZG2X2508210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964d656e41790d7331fe63bb723b640fcf4e266bcc9a5f7440d0b6848e276905. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZ5AB2208934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9968ee5faabba8bd97ba97b34a8f444124131b08422e449b68cc1de07941c94. 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/QZHZ52182382.