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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 0x020905f67bddd638b9acadddd3c9ef3de22c8d2c30d803dcc5032ef731633c3f. 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/952f0367-25b5-4f2e-af35-9564820f61b0.json and https://artists.proofprofile.net/proofs/artist/952f0367-25b5-4f2e-af35-9564820f61b0.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 0x33c7bc268dc032da992e9ec19d464ca65e3d9d54efd895f8d583547fa89ba219. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBUMC1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc385eb2751d3562ab564057aa1210afc5a6694dfa75aaeb869dcf7b4b43683b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/GBBKS1800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2254280f84bd68e9733b07efded5e7f9ae6e0d3f781d0419d3191e127f58a2. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/UKRKC2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804672466da3b104179bcec9f364fd179582be1abf6a4582bb15e263aad94f72. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/UK9C21900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2633617b1db84936bec55af074981670422c62206a904cb90012e3eff9d4a130. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/UK9C21900043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a1f026da9da860d83f2f6e83ef3eedf8d1975a9fc5f2fb3dd40a28722bd000. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/UK9C21900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e03fa8aad4958bf250bf2bafc14d5ca2af77e0a3110a191c4e70672edc16b2b. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/UK9C21900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77673e6f5c7c76c8cd55cfe27d2587f76aae637c6d819c7c2ae2bd666cc4f2e. 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/UK9C21900049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594cdf88a5cf77580fcc9f03121c88abbaaa69883f61e51384de86d1664f75c2. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FRX282359665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d223275d053d33cc03a48c3323ac893f393ca04014fe079c3a59b9b972594d9. 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/FRX282359666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54adae21d2415f9ea48ecbe56ad1e0348582155d2a644a9821d8cb41c97551b1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DGA0L2342217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe782a6a1b8c8d07d73c9ee1d390242101f61030a45f1b7c24dd02e5ba05d9d8d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/FRX762499642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f167dcf53a1c95b33086d6e2bb3f8bc86e3bfe83d0c600f79f97f5976630f80. 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/DGA0S2400859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75959ac882c5dfea47a1bcd741446df24f52efa1d3d2668561cd29251f5d0e0. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/DGA0S2400860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098e5323d04cf8d9678f4a4dbe62580668c1f6585a51d53f6100f171e42315f9. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/COAB11900157.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c33ef1d41bcea916b7464257ee79011d98a575972e1d40de0dab00e36c5aab4. 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/USC4R1902893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b03692f177701dd8f96f8b0e68352324fa4b771ccb235b08ab10f6bd016b9f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEOE82300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b7a799718ca42b297318ee763eae663f6f75fd50592c28bdc925244207ba06. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QMB622010606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61a8baa70affdc4b2adbc8ecd0a0d688eff53c4292734e0d6bb228eee45611d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBHLW2302061.