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 0xa9618f35a1ed6a93e87803166d8c2ba3047cbe627298dc7706c270d8ab9a3c5d. 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/647b238f-0c02-4f2a-83da-ddbcb1f685c4.json and https://artists.proofprofile.net/proofs/artist/647b238f-0c02-4f2a-83da-ddbcb1f685c4.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 0x446b83d7867921a81ad2afb5643c6bf59f399517da75b3b443dfd0f2236db575. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T13:02:57Z), 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/CA5KR2145186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb750db5c5e8fbba0cd24673a3a7c86dced6e0c386bdc7803d8c8306e0d2024. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CA5KR2246590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc12646c2b9153ce7e97f098d3d2c72a3dd3bd95948e16d8c2fbd921bc66bab. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/CA5KR2246592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10d6ff9146533a018ab0f6ad393df39a8fd47fca71f84c914a04a274fb98047. 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/QZMHL2244438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c7ede32db79123db8d234be98b72af745f480a37c6ba6cd36a181df5f80ef2. 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/CA5KR2319401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe410386003103fbe80825e117a3a22dc66c6f0c45915b2c7e5baa0248d8b79e2. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/DGA062368592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8107a220051b2998861279c6749cfd985533266cb3a8499b5e53ec949ccc80. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CA5KR2380227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556b89bd3e4dd9de493a18c947a646c165d0f111a45bea7758900381665d1882. 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/CA5KR2440573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f6734b8cecc6f136bcde2796b83833dc748fa7161aea3fc22bb9237cbfd936. 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/CA5KR2440571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec2f426f828581a01f9e6d9f37557903e5f51f2d022d513d5456abe785a78ea. 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/CA5KR2440572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556b89bd3e4dd9de493a18c947a646c165d0f111a45bea7758900381665d1882. 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/CA5KR2440573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9d694773266c4dad2b3a48aca61cd4e38b5657a82729b34402ec555904f6af. 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/CA5KR2440574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834b05664543591ab01810cc4bf9e9e93076d01d23ea34e202a1d3f9fc708e90. 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/CA5KR2440575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554d81e1bfddef420e03dfc4b85f2c202159760a4e2b7f667d47a5563429317b. 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/CA5KR2452245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f46218aa187dfcdfbcd451436266afe3532e12d28a71285bea05282baec255. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DGA0R2400512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c4f83904ac1d95cdbfc7277e065bc1337d548f0f00f6ef7b0379cb924a0345. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DGA0R2400513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2a5a067d73edbb3f618c11dfafca2c2be42b078185eff427b4e05b6f8f6cc9. 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/CAQOI2512941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9e4050375b1e6920bd3fd5fc3f15e40be38f760289e46b754c7bad3cb6d2ce. 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/QZMHN2047121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66489c91bd6f7188d7ed04aaddd59844c9d503cb7c6e10ac1626825063e7b91. 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/CA5KR2055786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554d81e1bfddef420e03dfc4b85f2c202159760a4e2b7f667d47a5563429317b. 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/CA5KR2452245.