thumb|right|A badge of the club. Optimo Espacio ('Optimum Space') was a weekly Sunday-night club based in Glasgow, Scotland at the Sub Club on Jamaica Street, as well as a collective moniker for the
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 0x183b47e9331f43a5fb3c5b6981d6fcd11ab0f82fefd648dc63a2035e348e0fd7. 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/6cb4f341-b968-4e10-b102-277e802163af.json and https://artists.proofprofile.net/proofs/artist/6cb4f341-b968-4e10-b102-277e802163af.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 0x6895232173fea5beeeb2d366820c5c1f01d4b6398f49c326f177729738c0b6aa. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCAEF1923233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddbd1fc28d773deb4ebf7ad28318767a9d930faf40d7a4ccb5f1eea5ba17520. 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/TCAEN1998277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a520eba6d96076822f11863033969aad4f2ea47bdb95d9a5fc0d86f437a5067. 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/TCAEN1998296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a2fc0f2e1636ba496f53b9bf0abe8cfa0fd49ce1751dba2f69236d10bc92da. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAEN1998303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc142b8d72304896c5ceef8f940bbaa8a2a08f37933819887ac773cecca92e62d. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/TCAES2094187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15d4f6c295f0493a125a7a3cff19e13cbad8990cebf560ced05527627f9c532. 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/TCAFI2173658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c6f15bf73c11404d95e2cc4345304634a990288a4ceae27858605945a6152b. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAFI2173665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560a7b30c353242d153411b91aa976e85c48e6e7c40b3036efeaa54c2bfa29f6. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/TCAFI2173695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11cbd6e65352102fcc3564f46cb18d759bd5e2cff72c2e8a43a41455fa28f13b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAFI2173722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f431dbba327843d93845fea4cec16b6a177792378c70371eb55526335bcd60. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAFI2173802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c40848d5c7cbee91ff5eb5af608e378b367373abb43a4d154268eafb3d59310. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCAFI2173864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f28b8035d17f9fc4534939e2d540fd41b20c1fada01e3e05886b798289e32b. 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/TCAHK2319821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a47e1ba003aba9bead5422900d986390dff6bb9c68392965a5943f56f53a53. 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/TCAHK2319832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc142b8d72304896c5ceef8f940bbaa8a2a08f37933819887ac773cecca92e62d. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAES2094187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716ec5ad17c90d7905afa566e74b991f8a42f849cc534a1399a25127cb409ec3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAER2024502.