David or Dave Douglas may refer to: Entertainment David Douglas (director) (born 1953), Canadian cinematographer, director and writer Dave Douglas (trumpeter) (born 1963), American jazz trumpeter
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 0xc54b2079959c756e873939fd4831579f73b0688910660102956a0c0851fb9906. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7c86b62-6a04-4b7a-bff7-8688aa254f75.json and https://artists.proofprofile.net/proofs/artist/e7c86b62-6a04-4b7a-bff7-8688aa254f75.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Royal Horticultural Society (The Remixes)
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 0xf4d262b8df4f5e3e1e11d347e9622d8c620b61b0453936f95ef6b7d3b842787a. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NLHR21400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf05075e6c480550eea2c1d51c1f7253b1e7da166de04dcd21c3a72805023a6e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/NOCNT1450020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf3ea79256907689d42345f0eb1e90462b49588e0f00fb04a1958a0b94660b1. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NOCNT1450070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ef7c572bef2d195a0e2ea8d5d97ab086efdd52d164fda3c1f3816e03ab1bf9. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/NLC7F1400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249b05c25a8ea10731170fce8c3516f30ba76a8126323890171e1f07ef13005f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLC7F1400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275926712290c33afbe4527f57a8084d609acdd5fd9e95d7d546c9daecf9ed2d. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/NLC7F1700013.
Spectators Of The Universe (The Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b15796bfaa0c471c83a5074ba34bcb4377c8e13dba79e10f3ac0499d4eba0e. 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/NLC7F2100070.
California Poppy (10 Year Anniversary Edition)
Carnival of the Animals - The Swan (David Douglas Rework)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6885df191181b75304911da6958c363e46b9d9897054c62fa103bc0a1cec42c. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NLC7F2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778d84b5c2135761e16145d6939d1579ab76e066afb2593b210ecd2a4e78a6d0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEU672001471.
Carnival of the Animals - The Swan - David Douglas Rework
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bac0e145d89d4851f6038eebfe91a136706809f939014b79f8a8b15eb341ac. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEN962232402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a85d26d87d7c87f85cf572ab662c5cefd16c97b55bed1384a0fb43fe9b96441. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLEW21500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5f2b134c739f05b43f94acc5abc9b3a26d7ed37f4d889ed67cc09ed2d66bae. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLC7F1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aea44147f9ef8e1813ef70bc7028ae08dedd88401a67f057956eeba47f96eda. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ES8741409107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac10871f3af1b63ef9aab3fa9a1985c6c20927d0d4d2e3225b200d957214902c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLC241700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef65a9b786e52fd614e2ba5eee195f6ba3bf51892115dbeaa3f4f22a1e01208f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES8741612107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3147dbdc4c1171d10b136f628d89c64d87c8902f74333eebdc427a0f41ee8cd0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLHR21200937.