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 0x420199ccfe3909748c1d9e0158b5bb933c72b4da0663d15fb11f3050472555ab. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d0803be-c5c4-4c3c-b786-f8e37ad6756f.json and https://artists.proofprofile.net/proofs/artist/9d0803be-c5c4-4c3c-b786-f8e37ad6756f.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 0x1f131d0231e34d12a6007ea7a5ed310ebfd8c5bf5fb2d2db2c46e33817949610. 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/IT7SU2210502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e1decc3507dd200134ea1665da0717bb5d1a06a6a94e8e790d7cfdbfcb6c69. 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/IT7SU2210501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76e00a47e86e7357fa6bdc6cf52888bb5925eb1d2af3ee52896dfb4b22fe433. 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/IT7SU2210503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418edbf291c88d1eb3cafb96c49e601c72b8084db10f0dbfe535d5d9babc83f8. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/IT7SU2210504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0de463477a144a5c88654d11da0067b1484d6a54ef22d17aa6d8ff9b3303355. 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/IT7SU2210505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbce54e6802d47704acec8b3188c440e16a2930b9d5ca53523fd5a2d59944dc7. 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/IT7SU2210506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9829696f0ec823dc632a4e19d1cbf26d604ebd64f2308ed6ee64aad87b04812. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/IT7SU2210507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81b247c6119f7fe245347284919e0ddb70130535dcf6a7e24d791bcc12cd7e9. 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/IT7SU2210508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1689fdf93b2760a048e598d5703e5c0ce0ee6632bf4d9a443e390b22066ebbf. 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/IT7SU2210509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2969b151e6632da0e31ca05a12bf00285e484e76288b6de6fa0ec5988c7690. 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/IT7SU2210510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f985e26592e7f38de2165cbc0df97c07f0570ebca98035aa3f8e54d405fcfe7. 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/IT7SU2210512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae2bfe12dc3c7598fe86be8dd81b9a1996e7e5d677b08aefdfdfe3786693e0d. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/IT7SU2210513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d07e9a87635e8d4493060aba7eeac078a7b3e4f4cc196825d69752b32b9313. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/IT7SU2110102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724027cd278ad3c18155abd0efbda873f2c10f1b4ba97a387d582416b23bb56b. 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/IT7SU2110105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf186949529e158c3562ec691f659fcbe6fe82361e0d25a182c065b6a681ee31. 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/IT7SU2110113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1395e79564edfb53d769dc3c56a99fb404c95f557a065559d166e2a3d2902e2a. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/IT7SU2110107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e3d0efdfbc4b1d878b7f9675c291023eb922e355ce4adddd5f4463326defae. 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/IT7SU2110110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b36b2941d4ae3257a4e633fe1eba24e311e71a91feca4a0445ff77c739717c. 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/IT7SU2110109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3237bde8fbb569e8ce7d9c40bbf23ec0b732936dca5a017cece141ea1d8a7f69. 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/IT7SU2110111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1674cbe09e68476429385f1d772df08c3354e184a9bf45b3efed01d5624ce962. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/IT7SU2110108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177ae01aa2f56e9789af6aa228b1a04f8c86802b4dbc2fad0f2386a4290adc2e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/IT7SU2110104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7690c9dc0cdad68ab661b2293104cda7d07e3404d227ca1b80cc3b97ac6fc165. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/IT7SU2110106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b835e4b2ca4dcc5d81b7c0c5cc9605e635772937d866a65b2e8c7da5eaf8cf4. 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/IT7SU2110103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33250ff5fcd82de3cacc3a8e06a9a3e54514e07dd7d0adcb81139064d763c20. 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/IT7SU2110112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478faa46442791a6fb8d7c04b601ba51d510c8c911aa0c08ac67285ac631dd2d. 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/IT7SU2410002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68a074ec4facd7a37b415af041aabbf7b001144b3bb90330193c9cbb6ceff21. 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/IT7SU2410001.