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
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc8dad82674727dec006a75f063f92a248142ee2182e2b126ecb46ce054eef2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T17:42:56Z), 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/BRQAQ1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8379c6b24458a8272514d9bf0561675eec8e34e12efbea4b9ba9f10bd0140f. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:48:45Z), 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/BRQAQ0800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfdee7d9f6ba799357a03e2bfda76d10fde7edb26b43465ff4f525cd7bd7d8f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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 958448 (2026-07-17T19:49:21Z), 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/BRQAQ0800018.
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 958711 (2026-07-19T09:26:32Z), 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 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/BRQAQ1100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe465fb5adc556e0221497718b3086b2e716b93342aa6b0515c343339795f42. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:11:05Z), 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/BRQAQ1100024.
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 0xe0687d9cb19346f8655835aa1468e06d01b4fcb49c09711318db02943317e26a. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/BRAQA1500028.