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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 0x702e61ff227a2bd7dcc6ecc50145b63d899b53339b716ad9be30998e4966a668. 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/c00dc003-8d26-46f3-8c87-acb9339304b8.json and https://artists.proofprofile.net/proofs/artist/c00dc003-8d26-46f3-8c87-acb9339304b8.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 0x86f094deaf862f15a3a7f537ecd7534c6a3f37461688729d51c12deaf216448b. 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/TCABY1434281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8794987bbb2da162f65b1286d08043a876b2603acdf9bc3f5402d32ea6bcc526. 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/TCABY1460562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adb09c34b3332dc2db976b3a3926cc1077e0e258ea1a8dcd0c5772bac278d6f. 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/TCACA1490862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658ad1a8433cad8703a71ba923160ffec5d57319d3ca62568c9c063c94c88e26. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCACM1603187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b72b10a90ef35a3162369b284568c66baf3f6bee14bbfe555b3e2075629cab. 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/TCACW1788853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8447c43db0d42af79197fc06627178e234893d596b8bea84c65fb31fcfad2ddc. 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/TCACY1784757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307ab20538f1346dfe14e50b783ae734834e4a2e1eccbd45a3b90bb21d574d37. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QM24S1840893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4cd9f38cddae2c453e8d1a6f5ff9d0ae2ef1158504ad54a5b42eb1dd33ddcb. 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/TCAIW2479625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541f873127e850bc05014e5009794f1f0a3fa60b1dcc07e45079c524ea719085. 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/TCAJK2561837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7b053fb0df28c948bd5732f21138478889060c6d22c341cb572a40611aaf20. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/TCADL1836979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21382f980f35dcfd177a37c47d43afa5e0b9d85be2e7f64a958f41c4d5bbd4f6. 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/QZ8QY1800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21382f980f35dcfd177a37c47d43afa5e0b9d85be2e7f64a958f41c4d5bbd4f6. 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/QZ8QY1800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f4bc624e0cc89e9987796af1d03bca07dc33de408bf4c330f324bf0dd29c83. 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/GBEWA1903885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d13e41c049b7b4c64f2e0260e4e5d19e9e236ff2284140b377d19528b8a6f7. 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/GBEWA1905500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5568362f3fbeebd54274a262cf83cbc109eedb5422dc115f9dbea5110316ac8. 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/GBEWA1905506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbb89527480001273d24dd542a5663344019bf9c9b22ed8a55b4ab8714d1fd5. 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/USA2P1805856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004741f7a7c98f0a35fafa3623afde6f128a7429a97bc3c2d7204529d0f9b24c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBJAJ1600546.