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 0xa04e997e6b8b6d95c967bedc718a275c6f8311c9552fd126e74ca377bf7a33a6. 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/cf1c8350-ff26-49e8-888e-8bd096cae8f3.json and https://artists.proofprofile.net/proofs/artist/cf1c8350-ff26-49e8-888e-8bd096cae8f3.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 0x3861a1219c2ad8b64b297e63c881aa6fbcd3ead790d2c1b136b482b4bd75144b. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QM6N21477199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1452e195587a676180c1bd451d3c6a2fca37784231fd2b674ad9a460f2d9b9d0. 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/QM6N21477200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70023bd3a4693cec5ae4f98d6ba3a036e6b9674d5693ccc04062fdf4cc116c17. 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/QM6N21477201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabedad9b89744dc99c338d0a20db8777070e6edb0341a0750971468bd66cf4da. 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/QM6N21477202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d75c694791f4a07a6d87fb35b1a0ac8ddb40a465d8dd9280cffbd5a934d385. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QM6N21477203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0b1b6ed7284ec42db83dcf23099d905b19f3869fad931d5e0f50f286de13ec. 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/QM6N21477204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd02507fa811304305f9921fa3cfcaf98d2fe9fa63b0ed51ed91170efc30269. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6N21477205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721b2ec999743f36a1af737b9e6d2786f4ff5a8b4426d0b79b99749e0226ac07. 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/USA2Z1901060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0f2721b34a62e1ccf40caeadcaf4d326fc4203a4c34d63771306b8fdd67d58. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USA2Z1901061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10045ea132480a3cb32d2ad00809f48b454c72588aef7e17fb2f0bff472100c. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USA2Z1901063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7c589dba496042fe942dcfd7a8438ff7f3e3f248eddb52ec6620d131416b98. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USA2Z1901064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29fee0123546ae9a912a92d36bdb4b29fd64ed2478d5b5b85a2c152801e0f0d9. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USA2Z1901065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd869c56089197f744f083f2b49a0b139ab234246c61ac8f2bacd7938dc3acc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USA2Z1901066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db5bd3b994fea0c960d6e113b1e797435fc35778f3a6148ff3a6d0bc5390ef8. 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/USA2Z1901067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea7830e07519837397c8df7add6ca18662cb2435ccb65944d13d08daa568ad4. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USA2Z2301685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8d77c4a5ddef8b4e6b70ef2b56beca8a126e2ed72f8eec7355ed2f4e8275a6. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USA2Z2301687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96064a6be0b6cfedc86b671d7755503df30302dd2e87cc736abc217679588329. 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/USA2Z2301688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea7830e07519837397c8df7add6ca18662cb2435ccb65944d13d08daa568ad4. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/USA2Z2301685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8d77c4a5ddef8b4e6b70ef2b56beca8a126e2ed72f8eec7355ed2f4e8275a6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USA2Z2301687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96064a6be0b6cfedc86b671d7755503df30302dd2e87cc736abc217679588329. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USA2Z2301688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59360ab5a02463d06048ca3852a9e76e4a483d7af88f46f61edabfaeddcce1be. 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/USA2Z2500724.