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 0xdf967ffaa79e59d6be41ff2c802035dc1eba9371e93ebfc0dd2693c56d53e192. 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/03882f9f-7400-4583-b913-8c4b7fd614f0.json and https://artists.proofprofile.net/proofs/artist/03882f9f-7400-4583-b913-8c4b7fd614f0.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 0x3eb05f7522c17f75e4d4f0d30c15de3053e7005b57d165daf2e6a4a9bc14a2ca. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SE5Q51808454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b15de1a4e5c3e7398bd6e2c9a363f52444fdcec54c617c89999a9654335d97. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SE5Q51801765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc1a761a91fc8c400bb3528718544d6f3c43a5d734228e63379ca6771abfd4f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/SE5Q51802902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2472cd2bdcd76dc9bca1d79f74d0c86ee6b08f28f97aa7e2fc99288d5dd595. 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/SE5Q51823534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f2899b1caa9617160c7953818e8b0844c7fab8b30bc0a418f9a2a493afda51. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/SE5Q51819949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbec296c7baaf750b740d05a3bc82c8d723dc0d9d0434e53fb295cd5f31e920. 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/SE5Q51819724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d76857f4308240673da661be1e7fa29685d09721b4d1a70b06b69c05046fbb. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/SE5Q51816592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6e63107714df19a1e0fa66c9c17311034050d41da8c3d42ce9b6b8526c7985. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/SE5Q51810518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1465d9836e7e0b28af1fee51cbf4df0cd03d7ca28b1f9b45b1eebe3a108a2eef. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/SE5Q51807216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa960f69f90729630acf4083abe23f96106b35bac03aaf837a59a569f7efa29. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/SE5Q51804980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c8bec7bb8d65f57381d03cc1d32c35c1a0cfb499eea27bd902c27e57909f06. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SE5Q51805914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f734587e0c140f8adb5f33bdbde89f7e1bc5a60c42761ae08982a2f79f5e9e. 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/SE5Q51814411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7be86b73e1cebc4185c3a4d8d46d1c2fb22e8d523c3be640baadf3a7c30e573. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/SE5Q51900223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de5d551ebc4170ace5903339f228a637ec622f97ce1fb9c4e52de039d93e9a4. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/SE5Q51829195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f60ff7c404942b43ce5edf3e93cbd8440220cb09d04abb4e178b3e36ceb1e7a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SE5Q51901194.