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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 0x0b4d44c8d20c83cc687b2dc6a271d2df2f190c731128188f3a9272dbb17a0703. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/828beacc-0450-4cad-9d75-ee1079a1be85.json and https://artists.proofprofile.net/proofs/artist/828beacc-0450-4cad-9d75-ee1079a1be85.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 0xdd02bc1b94b4eb91b4ea2df804228314d335b13064e05f717ef43f35d21f4a3f. 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/QZZ7W2462723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa4f8b3118de03a41eb9e21cdd9a686c124d332b06ec51e814f3d1bb9008fe9. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7W2462724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c3f877a7f392a7afb8c7a363592f660ca724e1313fc2c3823ff29f1227e8a3. 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/QZZ7W2462728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c73aab2d2cb673b6e2f0056ac9077bf5c3b60fc7a20ea5e9f5c6065e8248edc. 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/QZZ7W2462731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066dbe6d8dcc9dbc19859ed66459479a9a163f8ee6809f121b9fe172ae0ff566. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ42563993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9719cf986381adc183cadeb4a1c4d0ce82d347099f27235e33f148d2235751b. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZDA52511109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4869431d8d3d869ac52b67dffb06c5038af682690e7eee44c11a201f9290967. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZES62549641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf47bda5450a3bc44ab81ae58ae08560bf7513fa39a0e0e9846177caf9cbb1d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN52504966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd954de6e1bfb5df1f873b355d14017088accf3aaa78b6ff7e999faabff1fe24c. 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/QZHN72567350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05a115ce35106c59bc7b7be1048a2ca7ec79afdf216745d6b27d24e53727b53. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZHNA2568931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37b70eeaf94267845aa41da04a22709f1d63ad30b7a2b5618282c55d4176304. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNWR2569574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85391826788880cec5a8cf09b52016931f0b71fd8fcf12bf1e844d73bc39de84. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZNWR2569578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb451247e7fde2467dd08a407656af40e1b22e46727fb7f39cec9f750fdf9db6d. 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/QZNWR2569579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92cd94668a0f39f72ebd02c54b3b7a0be2dd3179c7b7d83ddc583739bdfe1c5. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZNWR2569581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c17ef1b1dfe063ef69fe528434120b3e88890838aeb3b9900c2ce09e10ab39d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZTB72592486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986f5d159ec1bae3c46e3ab469074e719f6afa51135a793cdc04de3bce670c3e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFR2541748.