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 0x964db932ed2ac32ec5d661f99a221421ff12895985ca6d576d871f006363d116. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f20dc71-770e-4c12-a933-907014cd67e1.json and https://artists.proofprofile.net/proofs/artist/5f20dc71-770e-4c12-a933-907014cd67e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xb19ab8b244dc05f3cb1849b09eb862c4116fa67bc0fc21ed98f432fb5f771c77. 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/USSF10817907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ec83b95fb2909a8dc6b00fcf88573de9a261e4aea33b434ab212236ec5d5d5. 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/USSF10817901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64b351de8fc57f6fbadb89780e2a7f7122bf4093973e92767053f8c6cdb0bd2. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USSF10817902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19482bece07e2e3af63126619555d90e79458af5eac578e4c60e41cb6cb9a6e0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USSF10817903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fd71485332030a930dd90390e72f3281f6ec2e831c09554fc4fcb1649e5c34. 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/USSF10817904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e3f120fb81072c7dae19345ecc71450af3f582cac298e840fdb20394b492b5. 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/USSF10817905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f654ea2a2ac55ab7193451c6ad16cfb8c8db7a5fd563fa80599c8be9ce01b07. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USSF10817906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19ab8b244dc05f3cb1849b09eb862c4116fa67bc0fc21ed98f432fb5f771c77. 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/USSF10817907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1100fac5faabbc54397d5fed77022c4911790bf7f46e9ba6f4208c5b413c2300. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USSF10817908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813aac157db95f6c9e76d402d3da20ada6a3c9ab3fcbf06d8a0b5183fcc45235. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USSF10817910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd47ea30cf1043d32d70d17963fd4a788d83fba43ab848d53cfed622d5abf36. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USSF10817911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63bf5c874020502cfeb9faff48b0bdb1e58453592be62827ae086e8f47651b7. 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/USSF10817912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa839ac27c3d2d5bfb9991b7c1597426eb61cfbda9e7fe4d948c0ebf07abce85e. 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/USSF10817913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21711067049ef7c2da3e3bcbea75f7b3d4106843e774dcca0de4f1d5f4c93382. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USSF10817914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f02bca2ca87e0a1379e160315327b5ef14cd8289eac76bf40afa8b49f379956. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USSF10817915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd362df4d562b0cfe56f0c5d055a529ddf0cbe936e309153d2c26c1e2c5af7b4. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USSF10817916.