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 0x1bc012220c8909217e34556f1bec4f6aa97694302905fc735479be0239eaa8ee. 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/c0c03762-7bf5-4f1b-bdc5-63be04b89a6c.json and https://artists.proofprofile.net/proofs/artist/c0c03762-7bf5-4f1b-bdc5-63be04b89a6c.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 0xe252071b29a7f49493c75bf2c1ed221d87713e2e5e75f34c5b0a20e345ec334f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USJE60810017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3017f0e0fd893fd64ae4100ce4ce7e156866566cb0b8175312bbe129f2221f8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USJE60810030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ce8d0cb1ae3bac78510483e544a90c8a712a51d52495b9686f0c93fe6b44bf. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCABZ1470275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79716b6b44253ab8b3435b7727e0a550d1cded049a9b15d4e8b4ffac58138b4a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCABZ1470282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffe13a53d9fac12445a27e5c69c7dec4914c186b6642aa8db67793209f556af. 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/TCABZ1470301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c348225048d8d98ae34fae7c386d7119005b68d000c7b80ee7711516e075d5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCACP1628685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb581771d99bc4e7e294d0156b09c47cfa9b28d0b141a7896dcc1c8f94558e9. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/TCACP1628693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fe9ebd42c9c7d2215abb7d811a703bf1b7e4431224a97922fc07b6e3d1e536. 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/TCACP1628702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29e223adc54fd57390a6d8a5699d7f438689ee4c998fc8e222a299ba88f678f. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCACT1650942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc321c5508729db1a75ee0dc3727e2d0c140fdd2665ab38c2b59bbceb20caa80c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNJX2187942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24853c305d09218e72bcad2a48c371770b9f73787f7338176bc15418d16c5515. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZPEW2585646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4ec6bee33fd6ee67a0ba42413b3b23f2e498ed11837148cfa26ebbe5f78bc2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZPEW2564141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61710ba6eaab9ecbdce0214504e8446b27637a24adb5d24f18be770d79564a97. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZPEW2582898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590634ce5d190fd2363be7b6538467023e387418d6b7e1041e491b3cb65a7959. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZPEW2582118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d5e1f3fb02ae75ecf5ab98a144a16712b322bca938037ed017c93240a336f9. 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/QZPEW2579013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7f3e6f25970aa8d84f6fe8ccaf26db476429b268dd841361fb59f38f631e4e. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZPEW2582121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae25f8850458203cb879b38f3b7ce400816f5f8863b5c9993d33e8be7239c10. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZPEW2582113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3beee0bbf01bf3d7c3123d0bfdc4dcb25c2471b271b168e21ed84e08d1fb833. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZPEW2582111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d453eaee510426b5b55c6d18158e173f1229f823f1ef95a4ae2dacf04dd4ad7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZPEW2582114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cb81435945e1a32c352b9fa846cd393efead75a442c06958d9201227e5e2df. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZPEW2582115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac6e8cc31464263ec64e4efef3bbfc89f790077415156cf1cf9dfe40f18ed44. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZPEW2578904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981eb1c539295f58a2596307e1374300835663a45b1859d13cfc80a5b67de979. 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/QZPEW2582116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8a90900b9916c09ab1f86afe49edbaf792c61f9f89da9c8046911a6e69280e. 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/QZPEW2582112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889a185b705b03bb667c622a520737085e4b56417d2b62346ed1eccc109ccca9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QM4TX1857615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24a0ab1691930f2f745b9543239900e193c4f52ea82ada6dd2abd0099d5b5dc. 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/TCADM1874288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523a498da8eab325680f222355ddbacba96607a1d2e74b878f0494cd69843ba3. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/USJ3V2391366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac7f33c50f74dcafe6da4143892ebf859798d777ba31969bcf1cd6445b84c16. 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/ES71G2500176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac7f33c50f74dcafe6da4143892ebf859798d777ba31969bcf1cd6445b84c16. 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/ES71G2500176.