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 0xc5517ba435c96c9f8662e6a5e20d4cd077fb9fdd9b28da23204f2bce44980133. 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/11287941-fa28-486c-8467-bffee17dc521.json and https://artists.proofprofile.net/proofs/artist/11287941-fa28-486c-8467-bffee17dc521.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 0x4c20b934ae8b32e5becf5679593c728afb2adf8b867df4cada4fce0787a52891. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/PLC062421083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ee6f78bf6bb6adb1c3e821dae3416b08746d7ba3b3837f3bdf233df1059ea3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLC062441003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe178d693adaf7524a3d482a189fa1fe253f951ae2377ef8cc3cffc268c46d. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/PLC062444100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d172cf853209f468a2e0c3b9762429f7a56ebbf82518df708347407df4a558f. 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/PLC062503381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa820e46460f4085e4bb487a2cb587a0cc6de3c8e788826985e6e44dc6b2f6f5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/PLC062503383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c17cf87a6efb121229c99101057c31ae7dcc6d2c5a08f98e3bc88ec2cb7dda3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/PLC062503385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35d08f9bde30b75c30ade8f464a8fbdc3c0fb1beb26749fbc42870c89c79afa. 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/PLC062438212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ee6f78bf6bb6adb1c3e821dae3416b08746d7ba3b3837f3bdf233df1059ea3. 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/PLC062441003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb804ff68886ae626bd08632d1f58151d128f3d8c376a9e7f725c5285ed53ccf2. 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/PLC062503389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898be1af2cea6f60adb630c9231e490549a17921dc750180569efab11b00ff5d. 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/PLC062432127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d00d631af5069d52af8eaeb4ec7d11c05dd6212462dd27991f89782afe2b220. 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/PLC062503390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190a4b59cb8b03fe5dcfe393f95fbe24d50e97e7e2ed40a543521dd55c6854d6. 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/PLC062503382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96a472ec7736e4e9f8d58e2b97c0dc6ebf7da1b91f6048738134919c25d61d7. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/PLC062503384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe178d693adaf7524a3d482a189fa1fe253f951ae2377ef8cc3cffc268c46d. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/PLC062444100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b36c15be8388a0c29fffae54c8545bd189c527bf1c995f1a19667f59347729. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLC062503386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14304cd7194f60e4f3add7da26160bec032e55b76d9e58eb606802fa2abf9f1. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/PLC062503387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ec3e9426b4e650f845b6791898e591b83dd42181a8730e62ea3b4c3ea7f52e. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/PLC062525109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b31aeb7db72326e740aed489f521496a5d125f6c4958697835abf8dd21b1ec3. 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/PLC062526978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d26a0ad0681d829f1aca7d4db13c51be3fae1d7a25145136b0709cc84bf5a10. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/PLC062528874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb968a7f64d6e3e19d47f3435f0fd8f101b447a27a4e8d1bed152139dfbbe001f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/PLC062530785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12628364169a1c283e43cc67a2028ced4155a683e5e7e7d4840c1d37e9c8ca09. 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/PLC062407395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3828dfac41e53b6a8175386c2f476fc1f6042f2e43b1a7e1ce36f9c6c36b27. 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/QZMER2596566.