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 0xc3221de3a19d91961a59c5beb3df0e150e5205d1ecb52b23e2220b35c89fea94. 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/7785402d-b4b7-4457-8cd1-edd0b7f03082.json and https://artists.proofprofile.net/proofs/artist/7785402d-b4b7-4457-8cd1-edd0b7f03082.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 0x4383ac63acc9b8a7dd29f0f3c795cf25bea01e5857acaf4dae72a78eda38d0f6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBCEL1600148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b11c58ca3c6924559b1cf4c9da4657f4d6bde13f8b7499083c9a7d21295a33. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBCEL1600152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4dbc924255df9968f8504e648bfae156e0e8c73e88aabe3f238435f01c587e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBCEL1600153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bedd2608a43eb0d74732076467e46398d35167fefe241707ed1577a97a6afa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMV8L1724809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaaa5c14d935e8e966dcad38322bdc75ab7fe30f88040742f09d351711a4fe7d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMV8L2029204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaaa5c14d935e8e966dcad38322bdc75ab7fe30f88040742f09d351711a4fe7d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMV8L2029204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b366a9bf1b9b0dc5d4bf6e437751fc3fc1aaaedffabcc2c4b240d890eee73b3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMV8L2029202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaaa5c14d935e8e966dcad38322bdc75ab7fe30f88040742f09d351711a4fe7d. 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/QMV8L2029204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1f9b6a5c5e85b22fd5258a7c500f6ed5a665dba0e989b1f46aa920f99ebe1a. 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/QMV8L2029205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08ab7ef8d0c9695ee4f6fee37734f63533383a356e64c01ebbfa439b1a56700. 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/QMV8L2029206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26d7995ab5fcf3526c91fda974bfe12c3fdcb7528d98fe73465c676601c050e. 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/QMV8L2029207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edbfe3fd4abe92884ffa24903fc3c6e77793fd68d75ddb8149a49a5e8f8a90b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMV8L2029208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716fc26ea4285683e033f94b010b3235996d9a8f04e11a997957b532b5db1f8f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMV8L2029209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a2b1e85159c35eee5536a8bc4d072e5b3b3a82b268fb95255afd2e05243267. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QMV8L2497201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6666fa4747c333005723f43c71d5caba95aa9f34f9afab54aaf1a9bc5059cc72. 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/QMV8L1825804.