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 0xa251c07a6724515de0ee8da941f7941772868b4750df85658a70a2602a31eb77. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/377ecb41-ec78-4ea2-a635-1a776c1a5d47.json and https://artists.proofprofile.net/proofs/artist/377ecb41-ec78-4ea2-a635-1a776c1a5d47.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 0xa9bf21f970a00ca4ff02620260f6e4b686aaf76d53e59b63e85cef6d90bb93a5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZWFR2453938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a310e05b5c5a108af32836c402d4810205082d67f543d1f12bb62f43140b436. 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/QZWFR2453939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8fb26d26c8c45805394bc065dd388542db43dff1b081de19aaaf3e92d270d0. 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/QZMEP2342137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d695ae6e6d819b5d9710b27408962c1ba279dfb148a0c15de2bf179498e12be. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZK6L2259278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8085119863c8aa0592957931e5dc79eeaf55f58d2496c7601d236a633773282. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZK6P2242489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9afe002fd340a59252b3c22c63ac3bac8654dd01cb79ec5b3dd174f27914438. 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/QZES52162041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c1fbb8ef6d223756562d1758bb986536ac0452dbba8140ff98098978e55fb. 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/QZNWS2047738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b8d2956087d453fffc99f0071e98a4eab6a47b7ab6d36c55c3a602665bd975. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHN82078656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16120941e215c123e4acaa83b3faf6b5ebec5c27c95b6496f1b187545aca32b. 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/QZHN52029661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f36a6f8384a0ce233a0bb26836fb1e94bb4e77cea553568c3536d5f30543c1a. 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/QZFZ62095128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e43ab89b04433073f0b6c9fc3481d0da6c2d7aeec52b36c79c524de9c1c05c. 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/QZFZ62095129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a692c511076e1c6ea00ce12db4492a4fd6f334d550edafa803d406af16e395. 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/QZFZ62095130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83df5f01b8416818008ab998b0200a2527aa1eb1a0ee697aee75993977a702d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFZ62095131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8843d64744627c615958a6b32da8cb6145b758bfe76d78f0f79f522492ad2ae9. 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/QZHN52029659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20afebf8c5e2d7632df220616150e815e87369358f809e4be7f8e9ace660add5. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZHN52029658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba3b4d6429936078f5188345c4d250e92b699034209a8a51480dcb6e7597f68. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZHN52029301.