thumb|André CampraTancrède is a 1702 tragédie en musique (a French opera in the lyric tragedy tradition) in a prologue and five acts by composer André Campra and librettist Antoine Danchet, based on G
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 0xff1735d1e55b8e187ca3622af6c9e5f1ce0e995c5832611964e90534a9816fce. 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/017bfa87-90ec-46ff-8403-b306e8dd289e.json and https://artists.proofprofile.net/proofs/artist/017bfa87-90ec-46ff-8403-b306e8dd289e.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 0xf0e4103411aac52f52236dba14e974eb3bf2e6a938042c906a53155e952424b0. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/FR6V81424560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cd2eadee17df90866f8014c1bc1bbff7bfaa717ce38ae37994c98154ed0e81. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR6V81424562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc3b7ef2200b915de40df64c357da336cab91cf59f062124f67123220897c49. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR6V81424563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73943deaf01c231e8bae7866018f7ba36a2ffbb45c827028822a56e349f7c07. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR6V81424565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38712725109a4e8079203012130392809676b272c59ba10f5fa5d871fade850c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR6V81424566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0917a5dd93530b2cc21eaabe3e7183b0a82bc0d2c9254c5538e4fef9f181f3. 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/FR6V81678652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd932009ce67fbf0e43a064d536ef0e0c6949b790ff07c25d3d777c13b7e2ab66. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/FR2X41519415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86993ebe4ed963c5b403830dac85f2365d01db0588eadb80cd15d3273a178bd6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR2X41519417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c6a259540dcb0a4015e69c499684a289adf1024ca788a2706d2ccf3ba6b3fb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR2X41519418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed1f15e7c5ec7e95613201d8cde73593fc6f5ee8b3a0fe597b523c896a43bf2. 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/FR2X41519419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb733580411ba985ad274a75dd503d0f55638fe60f870b70f95d6de6b6226d110. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/FR2X41519422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09665534a55fd4648cba4b8bbbdc65b1d6fad14f74b4ebffe680308b3da7b3c2. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRX201776278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5736d45ddc864a754ab408df5061a4b199d7ecabb19b053d780d39252ebd851. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR10S2228822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d37ff2ed567da303669e7586e16247ea014f4e664a4cf3fcdadd45ed604cbf. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S2228824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f6189f545b8b20f83026e726559d21cf443ed265ba74ef0f768210e914b8b1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR10S2228825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c635eddbd86c9e575d284fbcd9b18868a6b6cd9cea40266a3aa4afc0d29e45d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/FRX452163161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5637f05ca7276c7e06c064d4c8761398e6623ba6a906f1c77b841c546d8c1e05. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR10S2228828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a20ba8d8ccaf34867e494967508b1bcb9c45dce9e8732cd123c9324550548bd. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/FR10S2228832.