thumb|right|An engraving of the Hammersmith Ghost appears in Roger Kirby's Wonderful and Scientific Museum, a magazine published in 1804. The "ghost" turned out to be an old local cobbler who used a w
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 0x66b13644ab641af54fd6bea3e83d182bb3928d578d3e392dd1594a9512d902fe. 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/e5a095ff-93fc-426c-b63d-555a445ca582.json and https://artists.proofprofile.net/proofs/artist/e5a095ff-93fc-426c-b63d-555a445ca582.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 0x28477e62097a73cfb23dfcad6db574327e9463fb378408ef3fe8162ca4c78dff. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:09:30Z), 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/QZRP52145244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748b1eeffc2bd09863765590f2f74efb0ea7291e51c71f7ee9f9aadb083a5d27. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:56:38Z), 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/QZRP52145245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e60ca13f0e38f36e43801edc04ee12a74c8adbaf0fa0ed76d7055cd7adff82. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZRP52145246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4c5fced45d68e6bcffedde51103ef14cbee5e45fc1a85380feac9bcbf88d2f. 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/QZRP52145248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7280b9f8e18ff20d7ac68af323e3a9b760571878fce71dc313d93b763e0e2509. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZRP52145249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbbdfc559f138907c49656a1a14fd51ec64138be6f9ae9b2f243077f6dc8607. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZRP52145253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a50963afd79c53545aa23bce92de6ecec5756dc1ddab7e6aea9b77f3e993ac. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZXFQ2400392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2015daa2d48e6f2d9f5f07814845915197a89a720039471c17e877be319bfbe9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBCMZ0501220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0c0c6e49ff17bb358f6561051977a830f2ee9b2725a965d6d60f2679a10c5c. 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/USVPR0006582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bba8a022a2f64f042348dbb04644b08e163f9366b47511066896f6b12fc1823. 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/USVPR9906164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b90773eff1f676128e8fb458fcdd31da4874f10bb1dfca27d4fe1d7c9d5a90. 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/QZF931900058.
Total Reggae: Pop, Rock & R&B Hits Reggae Style
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8787bf562207bb7c0f79216177e4c5e44f5f4ec271a2a9d4a1d389d3cb0d2b3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USVPR0107423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607b28663cb136ac4b7d4f13adb78c4e9380e915d904dbbbb278bdb504111749. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USVPR0918306.
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 0xaf34f43616fcccc109c8db7b05afdefd55e47f546a6d25c20e3f94bb236eee2f. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GBCMZ0374564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe72356d1736b5202d76be7357487bbc0991f5ac89eaae61247f8ff2398614eb. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBCMZ0501034.