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 0xba7d19eef3ffc356bccfc52181c5cc351b1a73635c3c5083ab3b90e0976962ac. 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/272d983b-c2b8-45de-bf7a-bd0981c288d3.json and https://artists.proofprofile.net/proofs/artist/272d983b-c2b8-45de-bf7a-bd0981c288d3.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 0x487ac7c7bbeb026029681f484ac39c0934079efbeb0614fd97160720d75371a1. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/SEPQB8850016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4967b512a858ad985f1376d8781ac8d8d1b5fb08666b6e304d3699459d4a597e. 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/SEPQB8850017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4220ece03feac7d6ff781b5a118c6fad66ab9743a816022fc1f4ceb6d20f47. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/SEPQB8850018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131d024e36565ee2b52cf87a543746eded8b83b6a143b642a9b9b83726eb7abd. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/SEPQA1200178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d76c9de748037d2933959af5589583bc688da3cc2574cde06fb9117b0d9a6f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/SEPQD9023020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e309bcf89697c04e1b21d066ab05406ad7fbfbc72a3c3be4f7ba2cc881b330. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SEPQD9023030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcce14a135c22e35547e49013ad51952fbfae3712f63f0f64cec7fdb55a261b. 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/SEPQD9023040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad1258eb6a4185c04fbead0fce83112037b083af612251c6c0b85dd596d67d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/SEPQD9023080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf2d14230d546b2c1be003d87497cf01cc5efe6a49bb65918539c20f3fb0a42. 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/SEPQD9023090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0bd21eec995387d875640d1f06345c5b0524273e5cb90f917ea7783cd5fec1. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/SEPQD9023110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430bbb0b9ec8dcc6c716998d9d4fe209427a3c9719815d64dbf30ef3f08f98b2. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/SEPQD9325010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1957a7b4a8b05c8e8fcabd2ffa80a4254bfaafe832c30e9552150ee61e05b87f. 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/SEPQD9325030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1fc0a89400f7e9934fca82d21b9153cf2f7a681f67b04e919a7757155da6fb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEPQD9023070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131d024e36565ee2b52cf87a543746eded8b83b6a143b642a9b9b83726eb7abd. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/SEPQA1200178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131d024e36565ee2b52cf87a543746eded8b83b6a143b642a9b9b83726eb7abd. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SEPQA1200178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131d024e36565ee2b52cf87a543746eded8b83b6a143b642a9b9b83726eb7abd. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/SEPQA1200178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1fc0a89400f7e9934fca82d21b9153cf2f7a681f67b04e919a7757155da6fb. 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/SEPQD9023070.