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 0x40128b6e61a66a52ce7bec8e2a2609ff0a03bedd7e12cd161e9a94d8099a7668. 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/00885b84-31a3-4540-8983-8aebd09b30ce.json and https://artists.proofprofile.net/proofs/artist/00885b84-31a3-4540-8983-8aebd09b30ce.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 0xd28ca732ca7032ff42ddf6e7a6e19407114c6c9ccd498dc146ca5e0490dbe7d9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLRD52018925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ebb0863fc08896d815fed20059030845e605fb6d5fd1314cf303f4bcf6a508. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM4TW2199542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea2c4ae5f92669d23686b6d6b8923e95934cceecb295f5986cad1140963c5e6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZGLM2020032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93eb9465af711b8f8c02b29f5904a17d2df5cf26d7f6caf67711494a950d6d96. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJW2403546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6202268b9c0e302fd035fb794bc0008b49450ca0d1f49e9315758330215341. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBRKQ2454163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb311e8da5f85dddf5d249349fb44ad574038498478b3b5bffd0b3ee7e7a69375. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDD2390731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2048e76dd37143a1f073a7671787ccc2f18b86a4a28ebb94e296aa2d854b20a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES47E2008944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf8242185084fe143a0591e16856f07d4afb1b0b78a082a5f5ba76a8e876eaf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBRKQ2153234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55355c30c1abf5678e5abd5bdbf377ceb5175ffd2d71633488b7fc09e2aea5c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMFME2138789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd15c01a7b72cc31c4afe4ddd3933399987bd626aedcdc20776500a9b9ab9d6. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZ5FN2047942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff2c1fc4cb5a26cd5b6353a5d52f1f384f6a0c9d3bec06308aa6481ad09e14c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMGR32002145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de8918a9ac51930e8d57a4b9d6bbab26356314bee3b27682087d5f37e9b84ab. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZGLM2026787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b2e604c17dfa5fac37680a1f69af6012263a5be436978af4cecba319a9af2d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTAT2277972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2f0f5c6b4d578b3c31ad9d97cfc7a7fd61b30f1360e06da067a905c7023f9d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTAT2277973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe97c7133fb9e61ad60c66fdd02b8f9f709c9e7367d0e2039b6c095bad22ccce. 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/QZTAT2277974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc4e980e2bf8be7bd843dcbeffcefaf8a9c73494ccbdf1fd68443deb8cdee53. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTAT2277976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e508e360cc3810bffded74eaa80cdc3393603c94f28da4eb8d036edaba455f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTAT2277977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de23b39531bdbfa235da0d5cd88071ee0ee19c15b60fe21b07b60e6fbd075f3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJX2304189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ade09f28b8ee9e150d1d1ab601bbcbd5febcc8f5db4cefb542e24ab74f405f5. 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/US7VG2087056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f00bb63cf03da69f5924b8b49fc8641d4996ac863fbecf7528d740e2e0e4f8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKXN22232808.