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 0x4d03a03fe96aa20465df1feab98eacc5a1c5ec141df4fcb36124fd22edee52b5. Chain 2 (Bitcoin): anchored in block 954063 (2026-06-17T07:49:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47c189de-0302-4b93-a720-87a5a6a009ea.json and https://artists.proofprofile.net/proofs/artist/47c189de-0302-4b93-a720-87a5a6a009ea.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 0x720e86edee8a304f3c8f5bc18efe27681d3710d7559b7d1c9b022150ad300fd7. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLCK41023888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fae18299c20308017c434ec3cb3fcc7b0ed54cce8e6e87fcd303c340798665. 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/NLCK41023893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fedd1a15060a0be6f5f278d6da0d76b424a6aaf561ec3556f2822a6a1702162. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NLCK41023894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde935d9990ea02de45a1a21e433268aa3c7ecf1059c45ef75cca9583a1ab2d26. 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/NLCK41022892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5786e817e538782fbd2b49185ce24ac6679e64e059e36eabed279cf442368cb. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/NLCK41022893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223692cff97ccc90f68f79dcd18dd88d53a3c7b09f710af566eadc84f7d5e4c9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLCK41012040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897a4c839e879416271ac2ae730ad6dad47a6e957ba66d474c2a00fc282d0556. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK41015324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae3f2b8acf87599031fda280cee7fd08344206cd05ad499347aff403c997e34. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLCK41015325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626226621620c098d5112dcd0373f30ba7035db8ab4d8a235dc1621db960f95a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK41015327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e1f65f2a137e5c13f81cd8fe66ff2ebbe72dc8e2e72dd7eb28d30a5a07145b. 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/NLCK41015328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe519ba5b36934f288e1f45c460be51a3755f52c8532243de188ffddeeaabe7e7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK41015329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6718bd97ecc34784990ed89c0d272549777542eb03504d2f3018b841ea1acdf5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLCK41402139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40eb5bc41b7137b76bd7b0d132d5f6e672687537b8bcd06b0bb7dfe1ac07b30. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLCK41402148.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59484a89e15bc48e3aaf83e8f0b3f8ebb33b561d0ff0650760adaa79bc79a36. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLCK41043146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931c9798fc84ae401c3ba5b194ffec442b6d48650c3189727c149ab89a2f0ae2. 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/DEPN41200240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3162875f7716d57e9e823fec329a26b8a206ba645702f6590cd84725cb6957bf. 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/NLCK41016939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355502b767bf952e2c133ffbb90e54723ba5433eca37aca817c6306279a7c9e1. 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/NLCK41404232.