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 0xfe5445fd131bfed7d755701684a93c2e97da45e45f6f3c35668400ec109754e9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e8b0a2d-bc29-40cf-9dc6-5c262d159ec2.json and https://artists.proofprofile.net/proofs/artist/4e8b0a2d-bc29-40cf-9dc6-5c262d159ec2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto Grosso in C Major, Op. 3, No. 12: II. Largo
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 0x8fcfd4483ca80feea060cee927b93c98aa4f42882158990b1d3ad6e6bc9f120b. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DEA559033395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7642b26960d1327f3dd6ad3b2297daee962b2a4667a8422a461d0322b48eb6. 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/DEHY11200549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bfcd353833e3f5d7ef4ad0262ea7d64d563cc27dc67e286fe93ba61f98d415. 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/DEHY11200550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5a65d970d100ef780dcfc65457356361842256ffb890bf38300b5365d7d530. 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/DEHY11200551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8fc1bdc29c0d9f5562d4ab18581cba14870592f3accb7498eddc64a18ff2ab. 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/DEHY11200663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1947a39ff91d78e3dfc9711db9560331d2caebef3097d62de719d8de0f3254. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEHY11200664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cc511715426d2c84517754e4430d0791c8d3455c0453ad12516cca6af814ae. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEHY11200563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d55fa217a0c67f8ead9d32799ad573798363f56e1b4c5bf4221c49e86a340a2. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DEHY11200605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb876931b206d738bedbbe649ce0439529c938b23a4f42f6d3b7f0ef8ed98d1a9. 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/DEHY12001932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b370288e77b158702df9cab824d05f1b6572c00940282c32e039655da95892. 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/DEHY12001933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e27c5930f99cdff0b1a98e05df4a103f0316d2d9ea6ff9d3bfe9930f04416e. 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/DEHY11200569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f459706978b326db8478953070ec9ba4b21fb5318aff37500e80552901ee73. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHY11200570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c8172c45adbd15d4411c372dce5cf670cea21813b7480339be93571197c08c. 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/DEHY11200571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e85a3db41d919b9828b13f021e3dcfa76a580d03565016857e47e614e0064a. 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/DEHY11200595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3915df874a72f85e0d82b090836de4b991867ebdb5fc7a6477cac1d9124f7413. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHY11200597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac2299a972c5fd04f3f8f7644bc562db130c9ac53107dd18ba0fd0651be9459. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHY11200594.
Rondeau virtuoso - 'prince of Denmark's March'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a31d3c928892a33b139215143cf1c138cc54afe396aa7b142ea5e807baed3a. 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/DEHY11200614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e7f80aa8e1b3623c0b51805658e6e182d5bce46845c228d18c2e1bc8cc1f98. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHY11200611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b5d88d2877ba9e480098a83f42f1fc57d4b67a2064cc6fc0ae2af9eafd19a5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEHY11200577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f57c63d1cf610ab746bc1618a41c747b7a85baf3adf7dfaad6403123e44cb5c. 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/DEHY11200712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714cfad6051c6e297266772617cd5e24c40322a0153bf4c0e0a62fc23db66bc7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEL211903552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b7746d84e9ab8dbbd8cdb3dfaf9034354b6505cf127ba452ab7766794eba00. 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/DEL211902291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44507de6f5b36a49700d5609812b91a679ab0c1e7756cfd43ce8813a0ccb3fce. 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/DEL211902296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d45506ba2139258e73b1e70afde75a3bf90005ca9b2d4af14df32fc01df844c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEL211902298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2934822a657c297d041725dde0a97041cf98a16f3a4cc34cc003bd77183f89. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL211902301.