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 0x9fe88cf65941b227028380599dfe40c4a09e30fa7f9562039d4e29ee94d4228f. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df0faa0f-ee3a-496f-998d-0e3c7670d2fd.json and https://artists.proofprofile.net/proofs/artist/df0faa0f-ee3a-496f-998d-0e3c7670d2fd.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 0x709712c1db43c0b7695d8d038b8bb72c42f8aea66b6719c3ca08ce1ce558c450. 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/ROB011668072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb388175942778254eed3797fd162671b7a2465b00c73d62054cdee0ed715c2cf. 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/ROB011668073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3016205205bea84ee4e2aba715a8ceff073cdea03349b6503a1792dc1db5d76a. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/ROB011668074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd559fe764de1a3f60befe922cc05e693869fa2c9a30a8ba1280eb966db9509c8. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/ROB011668075.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ff71de96366f92f5a240e602090a538c3daaf7099c10450151fc3982215bcc. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ROB011668076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4bcd3279ecc52faac32d1530616e1156def0438c17b228f73db66d30691037. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ROB011668077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdcd26586fdeeb11ba8bb4bcebf6f2629384fef6197bb9405ee73d9d7d8dbeb. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ROB011668078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4771d6b393f6c040ef79f0656f00aa2e636c13601e8ab416beb524f32edb5e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ROB011668079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc786421686547f8137500f1113222c8cfe81d5ed5fdef75d761a75c09548a6. 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/ROB011668080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ced797ce49f67a5b6effda8c37cd5cf4f4fc0b352f55eb10220be524bfef89. 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/ROB011668081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf439d83f5bed00f54e75001be7dc04eb5de4c2094623fa6005ba17192026fb7e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ROB011668082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380c7f69b1dd76b4ef88ed8a73fe72b2e453c1b594850ce3c634bf0f057f4d16. 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/ROB011668083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ee26d88bb7d400aea37a6b366ea8b57c878545091d79472a7f4a91b5837633. 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/ROB011668084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4597b9a10878377dd9fcbf4ae34b49d440dbff6eacd50d2ddb38a73fb5ee83. 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/ROB011668085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d77b5ea8c8804a5b598cfa9630051c3822cf4dcccea328cf082ea38654149c5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ROB011668086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3da901e5da308f43496dafb9d66f38c2f5c70b2f399d10db4d19407a24d8ad6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ROB011668087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3028802ff1368cfe602207b077871461d2f1ac4cea7cb33c13d5f904ccefecfe. 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/ROB011668088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc385b23e5953f1fa3e4f724a38ead5e6ed6f75b8e850f6ec6799068df4f849c7. 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/ROB011668089.