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 0x4c65f1113699ea55ee2a1b18aed957a51d13fc8ee00d9234305a78695bf1e680. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb78f25e-34e3-49e3-9b41-57552b52911f.json and https://artists.proofprofile.net/proofs/artist/cb78f25e-34e3-49e3-9b41-57552b52911f.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 0xad20bf8d58531825ae47b81df240c7cf6390550a77298f256943efe3d8bb2f6d. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZGLM2232929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceda2ffdd72e6a33f5766e196217dda3af1cb3acc2304665ad9a49d807269952. 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/QZTPX2176827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a2aa289fba5149d9695b8c904fab2b4c59981e69484296da559dcb5bb05a41. 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/QZHZ62169740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ead5d49dd214fcdeb96cb2726c7d6ce8b1531bcbbc4a6dc163c2bcc1c9d47f0. 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/QZNJX2048131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e78d741f9170071538249ab5904c3511a700aabf97aba8d78d143cb2fccacef. 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/QZMZ92088488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd879ba02c7ba5e817e40a5643c89ed38e1f414633233e0d8801e6a512b8b604. 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/QZMZ92088594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323c108549ac4e721ad83b918ee6e73eda9204bb73d5357d70d7d5cfbcb27e15. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJY2179656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f405c20d2c1274054db2aaaaab6710bdc08012080a8415b7752495309424bd. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZNJY2179657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeced9b7c5f902c10e1f3cc72041fd6c656443d8f33d37b62291f22ad902de0f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZNJY2179658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863a9181d4a415529e201e92e085c64c1bb4529d1d440c6107201e0ce527206b. 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/QZNJY2179659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b627ddb23199b5bc2ef165da1a13442a08a89049d180a29bb80ec03c5d7eb30. 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/QZNJY2179660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c05479513960080ad961af8fbb3bdba2c6d0d89fcbd285348c410e6e2a210f4. 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/QZNJY2179661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220a67852836ba2efe2df0963269e35b13d7e4e4d5b4a4a9067932cbb9d67ade. 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/QZNJY2179662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabb7ff24b979dd81df8733bb87d1565420b3e7307af7f9d7b61ad65547fcb24. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZNJY2179666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07492259c89f519cac651d83051c721672ca154db2a677bca6d1cfa41ec4ccf6. 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/QZNJY2179667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b2556d6422af0aa7fd1ad12eb1c1c706d7c6c39bf987b5235b5e67e95ca960. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZNJY2179668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4020f20dc654e8278fa162fa05adce0fccb6138846dbfb846e4e9f0576036f8. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZNJY2179672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68ca686f8d6aeeed71229e01265a1f174e4d78c81e2b25ec8960a0faf5bd2e2. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZNJY2179673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ec4fbe6bb5990744839ca5bbdf2eabf93215f55d0cccc910a2b284795a1056. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNJY2179674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19053d103bcf83b0a2c4225ac95c523672a8c529640cd4ad8430e83dbaf5402f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNJY2179675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c27e77fdd73e7f95900cba5f045536b466bc3c1c627e98f05829072baff784. 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/QZTVM2226577.