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 0x5024a9c3db6eeac0858a292078dbda6c7a32a1f05202c70dbc165d051bebc964. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11487057-a405-47c2-afd9-08c561fe932a.json and https://artists.proofprofile.net/proofs/artist/11487057-a405-47c2-afd9-08c561fe932a.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 0x95869601d8b01975ce7252396f034bee24c4ea752e3b0a82a76bf59d754fe13d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/GX3Q92091387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95869601d8b01975ce7252396f034bee24c4ea752e3b0a82a76bf59d754fe13d. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/GX3Q92091387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8559b1d429e53e8b8b9a9dca3934cea43d94b7bc89df4775319de19732099d66. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/ES71G2404623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4c4484809c38abda47334c69421fe7a798f2f9bddebe03c53541d808e1b7bd. 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/ES71G2416438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f573f0675557fd0a09a1d05ef867223e703c4f27e11b35fc9f00ead6222d36. 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/ES71G2431696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54a657c8a17565d817ba09422a1c8f090b34a3a348b5fa944642d6196f7d47c. 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/ES71G2507669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8559b1d429e53e8b8b9a9dca3934cea43d94b7bc89df4775319de19732099d66. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ES71G2404623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fae2c2bcae0a972282e443645e10b39fe9d2ff533f1b9aabaf7dbf123b3c13. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ES71G2423589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4c4484809c38abda47334c69421fe7a798f2f9bddebe03c53541d808e1b7bd. 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/ES71G2416438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54a657c8a17565d817ba09422a1c8f090b34a3a348b5fa944642d6196f7d47c. 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/ES71G2507669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cde6aebb6b5b9ef9b88472d6dfc7bf9361a4fb3cde19786223ff771695e90b. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ES71G2508908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4012654dd27e740a4f1ba88f22cc718a8a6c2125357868f125708f6639b7445. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ES71G2508909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f739d24e0a52b43e42c522c60b562f39fd0ca369113dffa608cf35cf5f6493b. 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/ES71G2409538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ee114bd56003487ed8b903af3b0e5b7d6cbd0a855919c22789c72d47186ea0. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/ES71G2508911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe62b8432cb7ebdfa6ba3545f809c9e5b62d7841509044e78fb127960b56e327. 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/ES71G2332003.