thumb|A Greek Orthodox church between a restaurant and a hardware store in an ethnically mixed neighborhood in Queens, New York City thumb|A storefront church in Auburn, Indiana, located in a building
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 0x7d218a5bd51eeb564389201a05f2a0075f38fb0554f2994f6dfb30369aa1448d. 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/eecf5600-0d5c-459e-a791-fca587dbc91a.json and https://artists.proofprofile.net/proofs/artist/eecf5600-0d5c-459e-a791-fca587dbc91a.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 0xa5b7f048e85e8d3df7d2c2afa8224870b1f8bbbee571b195b85b14a8356b6a84. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCADI1774985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04df84451c86acdeabf27dc3efdf2bda15365eb19078e3359f05c46705f9f205. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QM24S1704899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a53c0c953c5370679c61fbaba4594857165ab0164d8d48ce4e7f7fd9970904. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/USA2P1950501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59604ab45eaf8816f5d231bf6e5e2000604b2b3ea3f857736ceb3f35fdc425ac. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USA2P1950504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be2bdaf12693ccc5c1fd072e8d03da12523c9263602b305144b5a500270d141. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZAKB2317603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed7fc55b21329b50729355b502999f4c039a543f9ffc9f850bdf77f32706d63. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USLZJ2474261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87cd697af7143916edeb68b77f4a50e71ef9d6122ef8e7934043ceb4e2af9ca. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTV32443692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d6fe4065e6d5224a201d3773ebb97f0f2f5bffae1d1c4476d8b0c9c1562140. 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/QZTRX2444713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01c33e96cda703dbf8eb06ca362cbf5303860256a4b73840a8d1fd180c3018d. 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/QZTV32443823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae99ac47513ce88588413d4fa05592bc8db6d225feb25d47ad90f6c2a4402047. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZTV32443869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3ce1bb964e3da5eb924ed0194cb99364ec9f99dbd29c806d969182b89d1076. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTV32443917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4ec316039e1ea301bea0780d489d55b3249dd8f12cadfea4f34912a1ef1b8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GBRKQ2483906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15435924952726af68c37c6f96d79f99850189269ebb8257380833366d41879b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTV32444005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd058ca4cefce84e0cdbe9206530d8a1f74c0be1d1cde3a3b639ed288b74584d1. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTV32444080.