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 0x74da8d881e6953f62b20d4799a8f858fb087a2e46522a2b0e74ea180db732a07. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92889af4-477d-47c2-bbd3-184b0c021361.json and https://artists.proofprofile.net/proofs/artist/92889af4-477d-47c2-bbd3-184b0c021361.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 0x4a05f278add5414468c127bd8e315517b34f114a0b6ec7e69c99307aace891ee. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEZ2046961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5daa5bdabf13c51a90da8d4b9b608cfe72a741005f044d2187d257b785bc2be. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/TCAFE2020418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69aa61c3c56dcfad660f7ba6a9f6ef19a3de1bafcc0b224c8d42cd72b2690dbd. 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/TCAHL2351913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8471d7e163954f63767271427214e1200488c44381da640f342ca48f685dc446. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAIB2467934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40ae3677268946d2f0395f23163e6467a2a32e8399ef60d9e23ca8f9f7658c1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAIJ2431062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0923cfdec3b9598d4df57d5e23aa40562a3593975d5b8d5885caec015577e3. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCAID2418742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c9c9931e85cb5a0ced30e55052ed991fa0ef7b1556cea2d49059d84eebc914. 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/TCAID2418770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a16c02a9f64af988b548e15f63f830dff93fbd6b61aa66dd63696f81f8fc0cf. 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/TCAID2418772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecf3f8e314121ab7aadba7ee644ded4645f91e984bf1fbea5cedca188b349e7. 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/TCAID2418786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d466f9418f17376728c0dbb34fb22098ec3d1ec73fce4cbcbe237c82444c138. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/TCAIE2418804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9df06b0c132ff2edf65d9075a20b4198a4d1971da8ce310c92948fb419929e2. 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/DGA0P2404791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb815936825399daf8d1b7bc021941e3c315efe005f26b76603c27ee53ea85df3. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DGA0P2404792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782e49839358c0ea0552c6c3d31ef8eb9915c5677ad98dcce9f03215f8fc5dc7. 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/DGA0P2404793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb42d44627e43b53f940ea8921a5be8eabb624cec70c1b6759bb73c234b6983. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/UKXN22386692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeeb1c569edd913c8257dcacef223e55dfa7bde58cc23e947c58e3cc6f401f87. 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/GX53U2055780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde78ca6118b86438600c7a23e8b9ec1df68366aa1d9621a59215c5a349796ccd. 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/TCADO1897219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccf75681fee6a2d539efd05b82ef43e554794539b8ff6c44f1cde403a2ce79b. 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/TCADO1823537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f30c9f5f37f0439abdd17fd69bd6b3d71a3438cf3d7423796d5bf82afc4e29. 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/TCADO1823572.