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 0xd278349388cb3f8e512401172ad48a27cea91fd12fffc6b08121c926619edd58. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a48f929-3dc4-4d2f-a81f-185fc9811fd9.json and https://artists.proofprofile.net/proofs/artist/0a48f929-3dc4-4d2f-a81f-185fc9811fd9.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 0x82fc52955749de9a97b9cc7f032e11f82b9fe800172e4419e17fc66e19b9d449. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/SE6SA2359531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3761e2c6050874a7dd564da28cf1954398c44d52c3ddc232dff6d4af498a265. 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/SE6I32453221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43931d4e0e6612a653cee3e22b68f3b7d1f34d0cde438ecdef0c36316543500d. 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/SE6I32453222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa7ee46f069ade73093970b8e71580e6f9b54af2a13dc76078c53cb86378aef. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SE6I32453223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df584b7afc5593cb2af64663b655dea98ae5e2996654cefef2c8c37b13ceebe. 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/SE6I32453224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aed74e58284243b9e88bb8b95766c123835e9d10459a27613facb7353c13a18. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/SE6I32453225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c93f3e9e9febc127f2f4b528381875eb21fa7df12ef7d7d932d066b9b802f9. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/SE6I32453226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0cc6b34594c06aa0739392747528738cb8668c5c5c92a60073d311958be46f. 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/SE6I32453227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951008b99d4173a62b4b01f921c642075e721c106845ab221d9b64f08ba05f28. 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/SE5752378362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6ac3321c0c7b140fa34f58e837776e9d273552fdfa5aaef014768fb625a29a. 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/SE5752378364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985d8ea0d099be80372468cf82ac984d00991f91fd52566c9ff2c9b01327f7f7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SE5752378365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd6c2867f32290fb86ee03f0a0b56dc0f3d3caa2c59ec4c45729a6ea32d4d1e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/SE5752239671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c17ef4fba8767b9130dfc05ead228d10fe9bca851a40490980701810a50d4a8. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SE5752239672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424afe1073201825a1ac3296f7b0d04f4f6741522c4aa990811d79a9f6fae643. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/SE5752239674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352a3b4a093999960b861826369fc04999ce05a2191e8273d076092a6afc3f56. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/SE5752239676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07500efb7ba9b1b12b31b9752206fff1316e800a1ce9ff23d8ffab2b077954cf. 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/QZHN92418921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6aa9ea50f09296a6fdf2de7715cd68dce5581150c70a596dcadd100713e5c7. 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/QZHN92418922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25e1eaef0eba16ae6ebf5c149b0fd270def65b5ca543ee25340789e53043469. 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/QZHN92418923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f618babe6291053b9784d0fe74d16daaf1c034e0be04852080e27465b423d98. 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/QZHN92418924.