thumb|Medley of successful songs by the duo, released in 1929 Layton & Johnstone were an American vocal and piano duo in the 1920s and 1930s, consisting of Turner Layton and Clarence "Tandy" Johnstone
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 0x84544f797250946f316986b483a9dafdfe456518e153e168be915827e85373b6. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce6144cf-2fa4-4549-86c4-40a68c0d5865.json and https://artists.proofprofile.net/proofs/artist/ce6144cf-2fa4-4549-86c4-40a68c0d5865.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vintage Radio Hits - 40 Original Recordings
Black Europe, Vol. 19: The First Comprehensive Documentation of the Sounds of Black People in Europe Pre-1927
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 0x4010b668c8cce7df45590d3af6e92919015b0a2168ad10679fda48d7afb94e67. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEC531280477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88085758b1b37206833a1769f8a33cdfd2ebb038e718ff400af5caefb1c06406. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/DEC531280478.
A New Kind of Girl with a New Kind of Love for Me
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acd1069ceb0ff7e961aafcfaf27d77227ebce5e7cc26ccc37aef296235727dc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEC531280487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0b2b93286ab46175f2e22cbbc3442ed0a582c5b0c7b9b5ccb05c521b4c1b2d. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEC531280494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce4fd9c3c69246991b0abbbbce1cb66577f069eccb20667edc8121abe11501c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEC531280499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab5d1514999fae3ecf3c6cb286d4f65367f41ca01ec036228d7222084993068. 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/DEC531280483.
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 0xe8c641ee884b54585a79dfa9127b8228808c9c8919a377cc9e14e2e86e1aa750. 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/GBLGL0953626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8381c4c8ad0e6787c3efbeb36452af496cc65f2fecbeaf41461f3791658c046. 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/GBLGL0953631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981a7ff8ed06adc4b9af4c3be681d76c0e0a1aae9f17626878aaf117d26f4a0a. 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/GBLGL0953635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57ea6d358c783e2304138a5bb9be6c72393298f993f5f493c4fd3253ab4267c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBLGL0953622.
Piano Medley Of Layton And Johnstone Successes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f6fc3997448a092ca0fbad87cddc0681fe1f841bc32b1270bbab90d6efb6e4. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBLGL0955836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4208cc289352af37b2ae669aa3e2fed409f1df6138d16e036723f9b662a5e085. 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/GBLGL0955830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c34b8cbc765576b6ea78656be7b14aaec7add5951b1059d49bcd19a133c6da. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBLGL0955831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00432a9c1eb82b913740a9c8ea4a0b2b2aa685241d0d29df74ba64a941c7b5b0. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBLGL0955838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183098db2cd0649cf1e7318a235f1977c72846e15c3552f5f952a029e2ca4a56. 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/GBLGL0955842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a0e7c108a956c431fd41892bef029e32cc2edb069b074afe901759e078ca6f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBLGL0955880.
Black Europe, Vol. 20: The First Comprehensive Documentation of the Sounds of Black People in Europe Pre-1927
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064415ceca0f976dc26d1ed02987b944209ed1ac21de05bc7ab5c436de96acec. 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/DEC531280504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b33d2648868782fcf6db929a9fd19ccb0008529ad33ee5237404bca8fb34c2. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEC531280506.
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