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 0x9c20687f413aaf8f2784fd78ccaed163a7aa0c33189b7fa885ea115d157b86d5. 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/8d7b1d97-b70f-4fbe-9e87-70659dd2e5bf.json and https://artists.proofprofile.net/proofs/artist/8d7b1d97-b70f-4fbe-9e87-70659dd2e5bf.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 0xca7dc0bdef9b344b1d7f25332cb1cc1d664994d4e4c588c4c74903d2fb948448. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZFZ61938703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c814056fde2cd612d14fdd348670d2ba59187b72824ffd7ea0c7ec51ac89e2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZFZ61938704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8f4c5b7ef9689015582676acd645561fbc1c2b7c756da651ae131cad59218e. 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/QZFZ61938706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c2b425b60e2ebc86ac005aaba168549565653f8a04c04abb8bcccdf836d874. 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/QZFZ61938707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d39324673425ced0a052dde83d1cf704574a9a464503f5ede818b531ff17a8. 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/QZFZ61938708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0857ad23584e4ea58fd0263aaa195208b71867d4954e9070207a77f3fda90870. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZNWY2009488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3a90ffeceb2751be1094b14171203896e846b8ad58079a571e329f5ce25edf. 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/QZNWY2009489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ade2a2600565a6211dd7a903c07398c40bf64500e3f2e52d1d724a0229db1a5. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZNWY2009491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdff67817ccc2196cbae75c355732cc15dfb9f326435b84d2158b34b8987828. 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/QZNWY2009492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0236a5fbeb39b5c34982863314f53b2057d63a62f8e69ac15a1c3eda7039185b. 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/QZNWY2009493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bfda79b6657e256db2474b6d1c0efc1e8c7a3782aa36e6fd89cae02be6e8118. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZHNC2178903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72494db934d9eb6b49c682536a40591897548a43168a627061716de0fdcbfcb4. 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/QZNWX2157676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc53fb79b5bd8b5a35342f55d8bd4fdcd2198fabe2e7b7d3dbb441796d15130. 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/QZNWX2174075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f64b5a5036f0d1dfc7bf644a5481bba60fd13b26d83e6d2195365ed8c4a11f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZFZ42380965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb540c1671a475c9cdb1516c6ba83fe74b8781d9d75dee793397002e2db037bd7. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWW2340407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86594766cc6bb9370f8286922fa035693817fce04142011879e552867ea3e50a. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZRP42322979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7704191a8e52cc084372b9484be871f08f39f68aaad997ce3f9bcde6fb726aef. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZHN32207891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824733862782cfe6fc064d0b0cbabf3da31a180d4ba574a47096ae09057e83d6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DETM41610966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc99b83c5eb7332194ff06daf24fe40ca7007cd06139bea21b185ae10ed027d. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZFYX2234061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a7dae52a84f7106b13a7c720faa70196a149cf834412343264ede23ad939b6. 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/QZHNB2204715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e6ba6298d62c1ed952e551b18122513f18da6b3c09481f8c8395f8a3eae557. 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/QZWFJ2370094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148dcad8c67b50880a4d85303498c57d3af5e2613eb7e32d7270c694a0371b53. 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/QZHN41956843.