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 0x1eca994ab6d66fbbd4c4bbe4547d0693d14a4caeb1e6bc57b941188267e9d260. 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/2e571731-d8f2-4c89-b2ca-5f18e79ee7f6.json and https://artists.proofprofile.net/proofs/artist/2e571731-d8f2-4c89-b2ca-5f18e79ee7f6.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 0xd92ec882b8b6d75ee1378007c88470265a954f8e7bcc9ea6f5f14553b853f6e6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMFMF1399789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92ec882b8b6d75ee1378007c88470265a954f8e7bcc9ea6f5f14553b853f6e6. 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/QMFMF1399789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c6c005b7722a1528403bb2298b5726df1714ed4e53179ee2b8f9d7ae9225f9. 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/MXD781901997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73888826bf5d80e5e2857ed46e549c1bf8c59628a5c7afdd4c23f2fe774012af. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXD781901998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbdd19a9804de80aefc44476439c22cbf00fb886bba548909580a271597688f. 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/MXD781901999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5dfd74ec8d52d0d55a0425d6cb36e66b8aaf8f7ac55787219ea1738b4792870. 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/MXD781902000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf888b069ec5c16d0430cfb66c5eaefdf72178e42a922b8123ecf106ff1a86d. 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/MXD781902001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020c1ca21eead5553f749f7ae7bc38a5f07c823e8b7891a16ebf27e552a2ce44. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXD781902002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff9faca6217d78a4411bbc9085b83171b677e10445b309b2f6d1753bdef04ae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXD781902003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe803a32d20c0a5bbdaf410ab1ca2e256506b8331bc27c987b10d9bd4f0770ef4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXD781902004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a0158bf73e34974c37e4d42c8b7e41868ecbd95536b042ed604679a44c6166. 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/MXD781902005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbb11aa17931ff6a7004d76c7c21e11e636e8a0e2b2fc08e6ca7dc50407f33b. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/MXD782002285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5385e28c663b61bb4b8b14da4f8c4e3f1179c7f24211608f6ab08b91bfd5febb. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/MXD782002719.