thumb|Military Policlinic in Legionowo, Poland A clinic (or outpatient clinic or ambulatory care clinic) is a health facility that is primarily focused on the care of outpatients. Clinics can be priv
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 0x50fb7c90b22a99dbfeccb4da268c315f4395de6eeb8c3c47160aaf828886f04e. 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/fa1eeb03-77d0-4d1b-b60a-2fe58160862d.json and https://artists.proofprofile.net/proofs/artist/fa1eeb03-77d0-4d1b-b60a-2fe58160862d.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 0x52cabc229ef5e237d3e3ab7b7d501e4d5eda470eeb9b521055efdc692bb4705e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBCEL9900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700318691df49afa0c4e3d782d17736c7a93ace305f452107414e675c4f5d300. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/GBCEL9900106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a98e0ef45ee0b5fcec8a674623c6e9fed7fd21733278289194827117c20bb8. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/GBCEL9900100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cabc229ef5e237d3e3ab7b7d501e4d5eda470eeb9b521055efdc692bb4705e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GBCEL9900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700318691df49afa0c4e3d782d17736c7a93ace305f452107414e675c4f5d300. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBCEL9900106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631f8976e576c50c0f0ad60f505fd231152bf86b63f42a7a56cd7e807e295fdb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBCEL0000135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273d857b5d435872ffbcd3dc9e61562a0250d6b1cfc41b2dca2332bfd263aa51. 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/GBCEL0000136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9238919fa10aec0b992b55f46f328b9b49bf5337d7b18da4137fa36a232b1876. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/GBCEL0000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631f8976e576c50c0f0ad60f505fd231152bf86b63f42a7a56cd7e807e295fdb. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/GBCEL0000135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9238919fa10aec0b992b55f46f328b9b49bf5337d7b18da4137fa36a232b1876. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBCEL0000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273d857b5d435872ffbcd3dc9e61562a0250d6b1cfc41b2dca2332bfd263aa51. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBCEL0000136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885b3e70690edf0f584e65d0ab68700bcbda4c01bf2aa218b9deafe22fa2c833. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/GBCEL0100487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ea35c88d1f9c94f30614bc71b5171c0dc023f12e82a55d5303bebe6f3dba08. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/GBCEL0100495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f94eb23c6d253fc04d63d329218265af70e48775d597a221594b208e1afff6. 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/GBCEL0100486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3330302b16915f2e39e5b46df2c15aa738463527d2f2dc615d77d145c1cf9c7. 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/GBCEL0100491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5c89c1c10a090c356309892e0a63d3223b3194d181688a8431bfb434df388b. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/GBCEL0100562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b47d010f9e010926271b8911f864c317e0ba6edefa542554a184d957af5785. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/GBCEL0100485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f61b8227cf2092289225ab93ac36a861a4c1d853f72f1cea86fdd32e15c9ac. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GBCEL0100489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885b3e70690edf0f584e65d0ab68700bcbda4c01bf2aa218b9deafe22fa2c833. 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/GBCEL0100487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb1f6dd13aa0d42ce9a38887833d9deea04c8749170585d2028aa2d29ac558e. 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/GBCEL0100492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f44eccb58a266a79d36d8a0a0ac2e5ee49190466645890fa258a02f92cdffe. 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/GBCEL0100493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff0ba5ebf7ff97025ff742e98a6e717a66f58d7e3642bcf4c4b2787dd7a0df4. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/GBCEL0600327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff0ba5ebf7ff97025ff742e98a6e717a66f58d7e3642bcf4c4b2787dd7a0df4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GBCEL0600327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6036788c71a364f727383fd121f08a7e2470d860e31442d65e5e0c785b910dc6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBCEL0800854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2736ba404c2ff1b03a5e680035f11b724c226285e409a444f7386f9819c7e00. 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/GBCEL1800509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9212c4f2c21a0e62273f66db97d7428dbcb44789c6dd1130d95d71b23bf5c4. 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/GBCEL1800510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2860098d65671386a79715d3ef39a3e97ccaa487f002798607f5dc5c7fdcd3. 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/GBCEL1800511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee70160642ac142d4d97bbf94aa57be6a8ab21711e220c02495dace87c16f5b. 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/GBCEL1800515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a64dde4aa88878faed3df0d2cccf17547d9a360f303b31b5826583044940eb. 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/GBCEL1800516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440cc06380216fb3f603f64b10f51d9ed071dbd16cf15fe5ce57b6e1d107f03d. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBCEL2000543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9299e2384e30ad829055e858a0bea30ada1e355f1e37ff5dc0021bd804e8822f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QMBZ91398951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f8f10033b9733f546107f1e885d8a268403a53e9e109cf440c99eb9adf9e95. 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/GBCEL0100564.