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 0x71d4b42d341b58bc60653c24138b15382e95e17fc021737352b520b200faa0a5. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4f6c80b-5b1d-4134-b6aa-73a2927c4021.json and https://artists.proofprofile.net/proofs/artist/f4f6c80b-5b1d-4134-b6aa-73a2927c4021.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 0xdfc2caf7d94d07182b76e4806a16c25b8f3abceadecd51b6ccdb684848439aba. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZPEW2549731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd1aaa290402e4354e847fd1cad5c7d4ba284ceb5d44a3df6d117d9fe2aa8f9. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QT2VB2509133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc2caf7d94d07182b76e4806a16c25b8f3abceadecd51b6ccdb684848439aba. 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/QZPEW2549731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b84bd16c6eff51093a5f0e27a93d401d50b9eca8f3a596f99580655943295d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QT2VB2509137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c3acb867eba398aa0a96d6913477638d7e528f8225c701b1f39ea688165f11. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZES62339940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d1594c57bc154ce35440906ee007040b9723f69b1b71c01da4eace3699ef95. 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/QZES62339941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d6d2771da62a48314cabdd6f7cb180beafc174c75324de349badc12fa5bbe0. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZHN72269312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81491d1a01692630e6d84b8400ae9fd0a830bbd2ed160bd7c9b0c4687b9e2c1e. 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/QZK6G2295219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74782ab4a04a3f81c6862dfb0779fface060dd296e911f661ac1d97f2c707157. 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/QZES62339942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab2c1ac0d92cc59a89afa2d7dd3d7a702bf02f94c7d8172e13fbb8cd29554a9. 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/QZES62339943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2cce56523a59bd2f255be233058494ff523be2f89ad27e68bea22fc4e40a7f. 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/QZES62339944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9eb6c229be72eedaaf5100637baac6077118fe44f09dea62214438013de9a8e. 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/QZH5E2117130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d464a65b165f77182f3f3502c337b167043abc2390a62f2a42db5e5faa89bea. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZES62339945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4b5a7913d170b3a8c793640aef42030813c8a0aee54edc836da55a2759500a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZES62339946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8e30bdb4634357f2caf4b288b82b388e19137c9be3c16cb7e3382c7181dfc4. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZES62339947.