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 0x2a9317fbddfd3d900b7fff5ddd64df705cdb13eddb3e9287ebdc34b433858bd7. 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/3a16e448-5282-4ca3-b9b5-01521dbf0539.json and https://artists.proofprofile.net/proofs/artist/3a16e448-5282-4ca3-b9b5-01521dbf0539.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 0xc13b28f5f45c6548081696ffe9be262c74ff85c8abcdbea65a0437b06fe670ef. 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/GX5MY2245700.
I: Thames waters off Greenland Dock, The Weary Whaling Grounds,
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04de929c8ad98c3597f3b9b869caadb6d53a47f838013c81d1c238bcbea42ab4. 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/DGA052248143.
I: Junkyard work next to Dartford Creek, rigging and reeds at Erith Marina, The Bold Benjamin, waterfowl on the Darent
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77112702dfd18c8fb53c6857175a53d1e521b99bdd49bb14d2533d8349e7d38d. 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/DGA052248144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60054cfd5ee1a06f7d68dcf702ed4cd1549df6476eaa17ad4955ae822cbb06b5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA052248145.
I: Water pump in Ladywell, Waves on the Shore, a Creek on the Llŷn Peninsula
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb934ff3e4e0750e0cb1ee6e5d78b22875c83a9de78ecdb4eef367a88e323ab28. 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/DGA052248146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d984b2c768c964ea18a5a0b33d4af6f198eab5a724586cdda5ce62577f8098. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DGA052248147.
II: Camera flash on the Deptford foreshore, The Rolling Waves, crashing spring waves by the Cutty Sark
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52710fe00374c7cb8a020c367035e30fe72ff0189dc76d71e365c315d142c21. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/DGA052248148.
II: Pump organ bellows being pushed by hand, the River Chess trickles, The Watermans Dance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cae0bebee5f8f53b34f3b30c8998ca264daedf963b1538069767316fcf30e47. 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/DGA052248150.
III: Ferry east from London Bridge, A Fishermans’ Song for Attracting Seals / The Full Rigged Ship
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29453ebc8eaa657ffaf3f7520c649b72ce36ecff5e21bf2f789ed4f96e66c2de. 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/DGA052248152.
Abbots Bromley Horn Dance / The Worms Crept Out
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a5abf5e3ba35a8d7a6644b2063b338a50b2019f7bab10ab83aa54bc702526b. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZS832400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21e7e8c909488f60a3d31c5c0af78960be7994fe62197970f67a44b53d4f850. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZS832400081.
Kissing's Nae Sin / Newcastle / Portsmouth (Come, Come, My Brave Boys)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d423e4bd62544637a65d0b0eb197b9661d8c5e0a1631b7586ae60b5d0c07fa. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZS832400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56363934f9a1fa0218546a8cc2e92f560d254c15b8577d0f545f48134b2106b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZS832400084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95779dab405654fab3cab4296aa34f1c3b517678161423e03628650021c86022. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZS832400085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789a54c4b3f06a597f135a1bc63c9b66e4c3d3423cdca92c13ff711b426f7018. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FRX282188835.