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 0x562edbbea7a5370b85c3954f054b67fcc039fda789703cf7279c62f87bae23ca. 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/ee21f625-4004-4503-8193-f55c46216ea6.json and https://artists.proofprofile.net/proofs/artist/ee21f625-4004-4503-8193-f55c46216ea6.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 0xc652c0d8ed0456568592ab22b1653d4888abefa244e893f02deb0309bcba7fe3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BCA6L2200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a76c4a4bddaa5d23f86189f939727a75a116b840cc53c7a067ae76bc66d0f79. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/BCA6L2200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01c4f91385e728987e4b2460b2397380a74a73e1e70ddd7081846a1a0b4de67. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BCA6L2200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373013d330c0c61a15c214087ff019609bf116531f3a383c80eace9bda64b99f. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/BCA6L2200060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c1a78ab1c6f53a5211ee8aef6174adf4338907b7715c49f8cef1f175b2b0d1. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BCA6L2200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f1b90d3f1be6a862863b69624c363894edef42e08fe83f9514f8506645ac84. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/BCA6L2200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b17fb0593bb6e166ce239e6af95493bcb0905c0ceeabec9ccfdc6ca258bfa1. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/BCA6L2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196d151fb95e0df18dd01f5e00e1d95cc6bfa769df05953da4f4a0a8c5d3e465. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BCA6L2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2019365fb593ea826c731cd6174fb3bb07910810df3b1eb0b4d79cd81b3464. 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/BCA6L2200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ba1dab2f1cf6dff89e5b27dd3d052584c4d723b33b8db2df29928d16d982ad. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BCA6L2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9214e2bd7bcdbe079c741559ab6014e00780e34c31060494fc6fa35e2aedbda0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BCA6L2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b592c3dc8adb172451d840385c0a361da30caf5cee20a848a21d5be20bd8f64. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BCA6L2200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d19012b600c7b3c5115d485027ad38348cf988abbbd46e27f68e91084a9a53. 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/BCA6L2200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30428c6684ea85badd1c26b7c38ae076df1dc068e6c1fcf9d4ec94fc416a9285. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BCA6L2200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5f70e4695a510ebb68367bc47b0f631323658cde854f4eca6681e9ef1c75f6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/BCA6L2200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328a1da2322f9c6d5df15275e234a19cf35ff4a2233aa970a0796ebeb8d32889. 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/BCA6L2200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0caf7bdbb47f9cf275d7464f4e24c9681d580903e49175d4d4207c44c784353. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BCA6L2200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9faa2d66ff9497a4af935402513d5e0740848c1b7bf14cecc9292186c853448. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BCA6L2200042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d51e117eb6d7e901edb2297f5ba49d211cdb2da4fc353987767cbe68be437d. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/BCA6L2200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0597e6b47a4eff2a98ed6395ded2be360b153b09014a50b293c64c01af492e7f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/BCA6L2200112.