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 0xa1e828d1afbf9b90e27ada6063b073989c4b8f6be8a8e8ed1f7c2bc669710f40. 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/80a6e52f-0a38-4afd-8d41-c2f2a1af3db5.json and https://artists.proofprofile.net/proofs/artist/80a6e52f-0a38-4afd-8d41-c2f2a1af3db5.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 0xf60653c67342e14e76f1c9a5520fb84f949dfeea13097813472683575bdb94bd. 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/QZ5FN2012127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9157357bce688f0c4e399c7cfcd08fcc8a1b22213e4377365dca227b88f9d090. 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/IT2VK2100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfe707d940efbe8edfafcca93a06645be70ef925e204b75aa7d238f009cbad1. 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/IT2VK2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cfb3ab94b275f60b33e0111e5f6ed79c7dec04b1f0de7e55c06720d1b00362. 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/IT2VK2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063d2ff8155b3e7fbc9fd28a734c3c5fadccb13fd9d56832997ae607cba626ae. 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/GBWUL2088022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce26b72057a81237ce4774672ab71ebf7672a8b37439578286a9e2beeb79436. 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/QZ5FN1964374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c58fa337b99b14fa8c68214d1d21e7afa141e480283a81bb8f56aa25aec8754. 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/QZ5FN1804702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912f78d2ea1de9bdd5f5b810b54de9d6a4e1814496f5002f6b74a74aa74ba6f7. 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/IT2VK2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdba5241d3c7ed906c15ece39b5c0fac92a4cd62711ad6490b6133984eb924d6. 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/IT2VK2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f3626ba64800ce255687c89e6fe6c77f4b01582840a165e10c12ea001a108e. 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/IT2VK2200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfe707d940efbe8edfafcca93a06645be70ef925e204b75aa7d238f009cbad1. 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/IT2VK2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5856b67a98fab08b4d0546b8e241c8c6b2fa5687ae5c1c2825aef51421a40763. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/IT2VK2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9157357bce688f0c4e399c7cfcd08fcc8a1b22213e4377365dca227b88f9d090. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/IT2VK2100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cfb3ab94b275f60b33e0111e5f6ed79c7dec04b1f0de7e55c06720d1b00362. 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/IT2VK2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60653c67342e14e76f1c9a5520fb84f949dfeea13097813472683575bdb94bd. 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/QZ5FN2012127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063d2ff8155b3e7fbc9fd28a734c3c5fadccb13fd9d56832997ae607cba626ae. 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/GBWUL2088022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce26b72057a81237ce4774672ab71ebf7672a8b37439578286a9e2beeb79436. 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/QZ5FN1964374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c58fa337b99b14fa8c68214d1d21e7afa141e480283a81bb8f56aa25aec8754. 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/QZ5FN1804702.