Arthur Blake (1896 – December 1, 1934), known as Blind Blake, was an American blues and ragtime singer and guitarist. He is known for recordings he made for Paramount Records between 1926 and 1932. E
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 0x253472241dfe066d4ca79ad07e393a4729e30a1ddc9b359b5c567576b2760552. 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/ef8b803d-7066-4cad-8f95-a9c7c50fdff6.json and https://artists.proofprofile.net/proofs/artist/ef8b803d-7066-4cad-8f95-a9c7c50fdff6.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 0xf1e7ff3e882f247a7eeabdb1457f81274fcc52da2e35f199299777e12d61de00. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/DEXO52468060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0893a7551367f05582aca29b3b8315d0682e12d133f3f21729704e151c64f2e4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEXO52468061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc397d04f587a36530eda19ebd2ca63b937d86d84bf27232c8e70154956990f10. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/DEUD92377548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbdf02a89609c34c91d8e60e55d5856563b5a87c0866fb37295a0bcfc69e4de. 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/DGA062315770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c289f4f6ea2611bbfcde986ac407bedf1c93b4ca5089991e39e6a123e2aca4. 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/DGA062315776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf57118f4441d3db541014c46d763d40cd58b9e2d12cf4ebd1bd4f333899fa6c. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USA560556540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caa2a099363e1b7f943f0688d89087b89b5c10ea85bd4a2cce6cf42d5a7221c. 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/USA560556542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf03b924c9196c7f87eeb3a7296bb553c08833b9a3c38ec45567e94eae864451. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USA560556549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5d37afed08fecbd1c06f4d31fd165c3d548800414efdd734f2cefec10b1f91. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USA560527404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1a21671ad25a69fae09f0ce7b853043927da65b41d43d37809dac6aa83b21f. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USA560547001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20aff588f945d66af2c9dbfad762b79f9ec296815f261d18ee305e08a6e1f5d5. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USA560575225.
West Coast Blues - The Legendary Blind Blake
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc17144b1f9ab2e55a05106194c91a47cd1a5cd31639379eff98df2537061702. 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/GBDTM1330033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58e3bccde8c76171984d1ca9a365096d61a40753f03c900a1173a15cfcd44c9. 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/GBDTM1330047.
Masterpieces Presents Blind Blake: 10 Greatest Blues Hits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f9756e0d4f805a690a95659b44d253fd573fbe789497229769b8631807f229. 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/ATW161501701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec8667f1ed2b3218b8fe4e1b5029b5a24943ab6366bf015ce1b5e9132f5a2ca. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ATW161501704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc732ebb4e59b1f9716318b21efdb632567e0faff32e11dc4f271973950769168. 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/ATW161501718.
Early Morning Blues - Best Of Blues Pioneers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cef2ba4513ba2d43d802680681973c6c77e8e78e01c7409ce62f42560ffc6cc. 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/AUXN22120261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3056a93b949995fdc16aafba921bd42c4de051a36bdd7208b05b0bd8f75b00e4. 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/PL06V2468396.
Essential Classics, Vol. 670: Blind Blake
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c00eaba9f8a399bf70c24a842f6aed9b8551f9087f81e7ee50ccd70c7985ce. 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/AUXN22505014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffba55e4b3910e7a361dc9bb910ac96c09035e6e01c6de683fcab15dc0ded91. 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/AUXN22505016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9d6d83e70fc393ce836d61b88803af1a8ba4a7bca956826e852755f8a57872. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/AUXN22505017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b6e453ae5c756cb1543ef68e15774ac16444329f3a59114eca02ad65ee62f7. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/AUXN22505018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc07cf416fa0546db43541845509ac90c1c42971ff3f20fcd81ae66d4d0bbb1. 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/AUXN22505021.