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 0xbcc8e942a222c9422c43cafe4b241a9ce1ac40a521c57203d0bad698716c6ac1. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0f3311f-a5a4-4cad-a84f-a0e3c568ef4b.json and https://artists.proofprofile.net/proofs/artist/a0f3311f-a5a4-4cad-a84f-a0e3c568ef4b.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 0x6fc41b20eb06f391a0e7fb99ed3b1ef299bc64b8eaf44b53abbe8014f08a74f5. 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/QM7282405374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fd1ea5a15f7f54261c71ba07a173dcbc346b3a66ca1642a52218cdc2a3c482. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM6P42400393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ef6b7e1e606ac628a9ccf4ca71b87cd029f11764f90d8285b2cb116c5be3bc. 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/QMDA72396712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8499b95830da8d1dd0d958c222ecbc87df291f22d43faee28481f7a7856678c5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMBZ92392636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91f3fa9982c42c7c4de47216d557a802bd19aee68fb4399b38c5193a2d0fe54. 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/QM6P42315695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b36d074f0dd9f1fec00915b08ba854609820e82c60e43430aa7a49d23ebdc2. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QM6MZ2357947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc75ca0bebebe7a2fe73d2b8a2df50481d76847f3d4ea76a9eab009b308d683f. 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/QM4TW2380738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c8ee80b9a13f53e926ea2bf09dc636a0091a2563e450f8e4d36f5038fd6146. 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/GBKPL2207871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fac4b78e1c9eefd8a5349a0aabfb4e34528f2eaa78418404f5f8b152a25234a. 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/GBKPL2207872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9c8037f9f9ac952ffb86dedabbd0e8fa10ab001e617ec0e5b4c1fe964d8ccf. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBKPL2207873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e43c71b2e2b38d82e1de51dc9d9c08cc469a33607c189fe8ef3815926fd1ae. 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/GBKPL2293998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc52f636e3881201118ec4319dd547e5731ea5480bef30998121e38fff53ccf3. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBKPL2205798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab5a7d8152140d49f5b08d66bbd12a0333f2c7fbfa3b2d8a2a7c24ea65a79e6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBKPL2204118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb8f0f2b6c5d8df4f5ee66a5014d479db8b3c177911ddc570d6a3df4b45721c. 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/GBKPL2204255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e43c71b2e2b38d82e1de51dc9d9c08cc469a33607c189fe8ef3815926fd1ae. 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/GBKPL2293998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fd1ea5a15f7f54261c71ba07a173dcbc346b3a66ca1642a52218cdc2a3c482. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QM6P42400393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc41b20eb06f391a0e7fb99ed3b1ef299bc64b8eaf44b53abbe8014f08a74f5. 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/QM7282405374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139596184320478097a0bee8e63ab8472a4c40a3300809ecaf4777c6e683f2b4. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QMBZ92432496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28d95a6ff86005cf8e5f0455f91d3e10a9f4b245e3a61083d8f83d83ad62dad. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QMBZ92432482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797924c7ea7508b80cc73236568a9b55e51970ce108b530acb5f741c96a79fd6. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QMBZ92432499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28d95a6ff86005cf8e5f0455f91d3e10a9f4b245e3a61083d8f83d83ad62dad. 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/QMBZ92432482.