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 0xb98b97e18f7966e9dd18f23403db8ff1d77f000bed69902006bd751bb0763432. 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/e6271f23-20b9-4f41-9604-58556830fe98.json and https://artists.proofprofile.net/proofs/artist/e6271f23-20b9-4f41-9604-58556830fe98.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 0x92f32eecd144b31150de24dc8cf1749c3c53e81df24fe46a1afe0dd341346772. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USLD91600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98511c9157599fd47676f6759da60a59f515aad14469a1a095a8472f7b204cc7. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/JMA271901135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5ee4f23f910fd02bcca48eaaeced46ff920bae32676159172479d317ceb25a. 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/FR9W12014269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0dde421e5a0de9c1f6f12176d88d13bfcabfab7ad407c43c6d768d7ee1211dc. 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/FR9W12016639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c096d0891c91f694ad51cc3bf72f49c7aa24f418583e10bab9c1c4ddb38a8f4. 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/QZTPX2224604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16904e5a8e86a385de073cd0f5bed1c85c25cf4cf50fedb8ab45c1e31e11db73. 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/QZNJY2260718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c5e31387731447e8fdfdfe2e2bae8f85eb9ca9005ebd49f7605c68856a172c. 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/JMI031500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba1940d73184de236004b5887ba8112e71e62b03555c0e510f99fa66c45210c. 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/QZPLR2247477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9b389806f51af3871c89bb96353211730525d818c627a49a7580beb63f980b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCADD1704927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9b389806f51af3871c89bb96353211730525d818c627a49a7580beb63f980b. 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/TCADD1704927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4999dc02c07e714d4b798b017bb61fc65e8e86c3fe73082015b000c555e1b6a5. 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/TCAFA2091715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61d2020cee0b32cfa31eb161dbd08afb2f4e2c2ae52ab041c209f3953f60c4a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USVPR1400475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16cd9591f973938314d850f4c6292ef67012486ae2bf47840b033516628b07e. 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/QZNJW2301439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16904e5a8e86a385de073cd0f5bed1c85c25cf4cf50fedb8ab45c1e31e11db73. 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/QZNJY2260718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c096d0891c91f694ad51cc3bf72f49c7aa24f418583e10bab9c1c4ddb38a8f4. 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/QZTPX2224604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc6fa80b46e1a271145cbb08cc836ef4d30fac9f712204baa5e125f77360736. 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/QZGLS2436902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56c486eb4e89e7e2970b4e7e7fd6e348fabed874429f6d618821b06fdadd81d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZMZ92428792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4e8b247462051023b77e458fcf63f48a27e3c8aaef106d08741302b7a897a2. 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/TCAEW2046629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc6fa80b46e1a271145cbb08cc836ef4d30fac9f712204baa5e125f77360736. 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/QZGLS2436902.