Dave Holland or David Holland may refer to: Dave Holland (bassist) (born 1946), British jazz bassist and composer Dave Holland (drummer) (1948–2018), British rock drummer Dave Holland (Klansman), Am
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 0x70889af4af36748abde5b7d03e99da331a98df154d53647f2e00b2aaa504b87c. 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/03759f4a-555b-43a6-bdeb-3d1ded2af826.json and https://artists.proofprofile.net/proofs/artist/03759f4a-555b-43a6-bdeb-3d1ded2af826.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 0x30cd215810634996ddca8f3ce79e29168e6b2b36e6c209844398680f907eb1bc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USC4R0511542.
Feio (feat. Wayne Shorter, John McLaughlin, Chick Corea, Joe Zawinul & Dave Holland)
Double Image: Rare Miles From The Complete Bitches Brew Sessions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd229e547064bb00a185f4a19935f5316c3b52e98a36830292a7baad0699f72e8. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/USSM17000359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3c66b16e6e7a336292c184689be94ea24964aa45233293390c47a1c29161d9. 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/ES5701100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b9ffc084d2108f37337485047837ec33565259e0377c3a15a09b11a56a6017. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USTE10459805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e5fd9107c2ecf9e3af2a174b4b6318e595aa77caa0e80e6108971450880ba0. 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/USTE10459806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4b354fba24b2f9c7da7ab193519bebee8b559946ead62c5f96c9714900aa91. 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/USTE10459810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9426e39f7d0da5f487d67aa686c5a0749eaf0357f85ab9f644a83105444414b9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USTE10459811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eacbeb2a4f607881700b14c041a4c01b5c35827d59d99923b273476f9d98abb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US29B0400028.
Improvised Piece III - Live At Little Theater Club, London / 1971
Improvisations For Cello And Guitar (Live At Little Theater Club, London / 1971)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8a42ee1a337d482d41d8d6813715889261e60d5352ee593210da0db6d543b5. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEB337101301.
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
Improvised Piece IV - Live At Little Theater Club, London / 1971
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024c5f1776a4240d90af8c96536ca8e2de1e74c659d01c6222a0ced6150d4207. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEB337101302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffdf2e64d9a91a11eb7bc00877d59e894e63121b10fcb0881213442349c3b20a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USTE10459801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66e55d9540dc0416b09825bd6268b4e6cc36bbde5b1d33cb0e165c26688a79a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USTE10459802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b07c227898b851faa4f155ab53cb8fc6bf236ee1268380dc4546389d27ab2a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USTE10459803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56312d14b79f227ad4bdd36dde652e8c7b8905fa88fa0993ac0e9b37dcb8ac16. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USTE10459804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5523f21766886e9d49ca333bb91cf143dda96ebd5363cfd6146d2731860f88. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USTE10459807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20243ba090f35d0c7112a6086c1e748831c1cdee880d553e0bc699f66000adf. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USTE10459808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf600ca91a8bcfdc8597655bdce1aa4dd9a62ff1e650146dfb8b2e6703ee1f4fd. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USTE10459809.