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 0x7463bf0280c436a1ea0b8fc3a3fba136929e6817c09d09c375c0bedd73256054. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04a78bff-8012-4402-9305-a30c2b726a94.json and https://artists.proofprofile.net/proofs/artist/04a78bff-8012-4402-9305-a30c2b726a94.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 0x28cb792765a51d7375ebaebca2cd01727ff871610aeefd0c3ac695156cb7dc06. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USHMD1018205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06acfc7d5de4b48714f49ed6a6bd468dc6fb1354d93b3c70970c99fa69fc3d02. 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/USHMD1018206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d52538128eee5394712fa283310289aef5875b9b1d1a24294903230ba273e58. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USHMD1018210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffad8812619daff7c1846a83dea4a5c79dd1f7cde543fe5be02390bc3eca76a. 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/USHMD1018211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a2c831f16a8de8d390af3eba8d30d9b6bfd3c2a6d29f6085e9ebab3fbd86f2. 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/USHMD1018212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff587af731a338b66c01bd668bab01e5abad745163bf33eb50454a9cad018087. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEX260901004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25ed225989a13dfc46131cd40446e4e3332cb00e1ffccd908bd7ec3e231fbc8. 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/SEYGW0800302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe094cb0672049a3bb3c4cadb1303e87b8ee41ece7d41f2a96ebdf515a705a850. 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/SEYGW0800303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7344a27a7cdb77ded638054a472747e4f683693baec2edb07bfee20a35bb367d. 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/SEYGW0800304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5d114cfe0e0bca42a87c5f7d8d7faff31c5efdcaa41dc91e96bdbae24a6540. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEX260908003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d087799341caf511a48293c518b74f8de47dafdde55284e5fb1fdafb162a6a. 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/USA560892710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1806bd1d79ad85eb80a7397acbf82055c41a0ead4823d4d9a6f6462bd12d8fa. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USA560892712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5bcbfc88d1e1e5002be4c33648a3d49e54519131c04558d855a51865057ba9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SEYTP1201936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4f71b16c79192e0867491bb8ee737348f282850dacdc0d5b6f953b96e84d78. 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/SEYTP1201901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad862210618c771025ce681390ef46832bd36abb131fe0d9b9e70284b5d5e8a. 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/SEYTP1201904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecd7585c43404fe6fc447788e6634a939ae50f03d386cbb504c5131b46077a6. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SEYTP1201915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9d5d6cceb443b014e2303caffe69630bcbbcb901742e5ced9bd7b743e357d9. 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/SE2ET1100402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77359a8bc012d8f2103591a5ce79770621600f2fb57940babff995e2637700fd. 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/SE2ET1300103.