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 0xce953dd06edacc9dc4c146c5bbdd16d10ab67193bd073fc4f824a240df651e1e. 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/a1d787db-e9e4-4e33-b4dc-3fdcb1d7908a.json and https://artists.proofprofile.net/proofs/artist/a1d787db-e9e4-4e33-b4dc-3fdcb1d7908a.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 0xbde6955ec689a7f9ee02958fd6c80dc77c68f2a97f1042ba85b4902088f76372. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCADM1839522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64474e381599cbd7e470252532712ad6bd4881e1f8c2cb9e166b2f7cfc9aa0a7. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCADO1850428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccecaf212238f4fa1cf69330edc29500d33ebba8f1e8e12619eaf4f605e6f956. 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/TCADO1850589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8f12d003e4bd158b26f9538eb0388e3f9390af14e8ef160e73a3b90ec13553. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCADO1850593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b934c3a76743ea72799328da0495cdb85fdcc72752864c110cdf5747af47289. 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/TCADO1850618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ed9767bce6724d37759d8c41aa981ff5ed78e0c9a3d39bca46aba136b30704. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCADO1850436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219754970326a40fcad92117ecf4ddd5a4ead81f1596c1ec71a272ad1697c9a2. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCADO1850439.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134c1ee0f5aa3d9bd010ed99611cb87b1dcc3fdaa2ce5779c784b8afde117963. 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/TCADO1850473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e288e175e96d7f08f538a203b4e0f266b3086aaf66d048ccdf9dcd13aa4073. 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/TCADO1850476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c256cff8150404f784e1fdfca538b58929498b6a55dac1bbaa3ae19c03c2915. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCADO1850487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab336a79e7dff06fee785f90152e3ca53f667010364e441ec417b2da06ae4b0. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/TCADO1850588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595572c97ccb0913341b4c356b603ee0d1360d7582dde6a4ac1d45952c511800. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCADO1850602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a5de588e9fdde848242107c1510bc4e10aa8769c35e3ef9dba6834ed4be7b2. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/TCADR1827449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c1a987e7cb7628fe547cbe2eb9b662f44cea5f1e986545279c334880c501eb. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCADR1827461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8931e5bd875fe72795aa76211cc46a96cd42078b37105ea42ab1fa803877de86. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAED1910167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017c6b4011a5a9fd25e22aa6b4aefff1dba488b254e906350cac23de91fb9734. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAEM1945121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d3ddc5bf715718e1b46a39b04f6df3262ab361495e24af314cb5e7e979dd11. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/TCAEW2042887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c950f41afea794198f7128fa9117095340776ae156b3e2ec1953fd8fbfd2b67. 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/IL5842340799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1528fdcca92bf1a34086fe1e10e0edf60855970579c8f9fb4f9b982dadfb637. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/IL5842342949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1037d4345ceac16902170a69a5f21e046925192a473a2d9e0df2fcb41034b8. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/IL5842555750.