thumb|A cutaway diagram of a hangar thumb|A Royal Air Force station hangar A hangar is a building or structure designed to hold aircraft or spacecraft. Hangars are built of metal, wood, or concrete. T
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 0x1e45a375e65450cf4d1c3ade8590fd0b7d4312c6334d6286fe09d57921436b0b. 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/3735f724-fffe-4d88-b174-084db55067a1.json and https://artists.proofprofile.net/proofs/artist/3735f724-fffe-4d88-b174-084db55067a1.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 0xbbc8dad82674727dec006a75f063f92a248142ee2182e2b126ecb46ce054eef2. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BRQAQ1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40446b65617138e26028ff71e76ba8f52f4736339d04f2ebc8859aa23eb8688f. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/BRQAQ0800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8379c6b24458a8272514d9bf0561675eec8e34e12efbea4b9ba9f10bd0140f. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/BRQAQ0800014.
Captivity (A House with a Thousand Rooms)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa473bdeb791de2924277c2d6568b78eb83f08e4094278430a1c758e82d28e1c5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/BRQAQ0800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced3b8d2d8353363bbe2ab79c63220270aa1d20d9b6834e4a442e77f8f12bed0. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/BRQAQ0800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfdee7d9f6ba799357a03e2bfda76d10fde7edb26b43465ff4f525cd7bd7d8f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BRQAQ0800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490da142e71dec2779ae983cc45af0b8553d846f558ed74350c600d262cebc45. 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/BRQAQ0800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1dbff3c61caeca15f9ac034a361547d80a60b5112a6baec37f01c48f7c5d59. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/BRQAQ0800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d4cfd2121b3bd7db083c76f482b8ee399842fb83608aa6ee832493df818b62. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/BRQAQ0800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc996c72077dcb9c34da37884463f2c6562a3758d55a508337990306b37ece95c. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/BRQAQ0900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0adafd2dd7cc46edfb9808a460a5622618f5d2f32416fed4987cb49f7e4ea96. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/BRQAQ0900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149a915e308f1b1f95cc2f40ba88b718720078ceac2e9ff7bd8ed2a05a7aff38. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/BRQAQ1100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63db6bbe7515c16526d2173b1516624e1c3e98d21c1c5149dffcee55dbf773ac. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/BRQAQ1100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457213c15c253bc1725a2d3a5db6364ee087ce5c8bce0d5abed71814a252dae3. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/BRQAQ1100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896e43d1465482481ac0c4812a77aef14e30c3b78e9528d0c951e73af62d1de3. 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/BRQAQ1100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cdd9af34cf6bc17b06c1f6667c0f3a28876e29ea4a271095459ba67526df3c. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/BRQAQ1100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efd304bb4f037728f7321bf5f6af7f53efa748c6abc898fe2c41af7f5828932. 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/BRQAQ1100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf5c9890eafbfcff7be3913bdfe2db8fc700645ff7a0f752365f602cd191d8f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/BRQAQ1100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188102be615ebfcb3fb86c42d75bb0ce2fc4770385c794aea8fbd1c4d947b87b. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/BRQAQ1100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe465fb5adc556e0221497718b3086b2e716b93342aa6b0515c343339795f42. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/BRQAQ1100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51636d64ae97ad8e89431f6217161869d7042f49a5898c8bcccab112b1dc834. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/BRQAQ1100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ec53b1ad80a8c00d29037ad84f8455ee5493a961a28d636b235e7cd8ba97b5. 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/BRQAQ1100027.
The Best of 15 Years (Based On a True Story... )
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c70eae65de88dca582da538c17df12bfe7602d621d8e9a3531dbfdd404f8fc2. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/BRQAQ1400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876605b54f97432a4e2ec3f3bd4798ce215299cf160f10bad62b619676d44d5d. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/BRQAQ1400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e75c516d754850dfe64a1ee763da0434311d8444c99a1cb88f245a35e6b16f. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/BRAQA1500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0687d9cb19346f8655835aa1468e06d01b4fcb49c09711318db02943317e26a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BRAQA1500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad21249f6920cff11199404616150987f691b1112b9abb9b8d17a3dbd26a762. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/BRAQA1500032.