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 0x93e67f041c282cf225e56b4014d0955fcc90ab1d33002ff5ac6815247dcdc017. 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/cc34ba57-5681-4a59-9713-0ae3d8cd0809.json and https://artists.proofprofile.net/proofs/artist/cc34ba57-5681-4a59-9713-0ae3d8cd0809.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 0x98db3ef0fbe80d0160fb3716cd3ddc51c7771a4344ed7619499781e560c51ec4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/SEVSZ1200801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b0dd159751c1a8529eee987b1599ebce0dd411a5aa6ea3bccc000b0dae4717. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/SEVSZ1200805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3285777fd76ad744e4276fa2b08fd48e27a54829ac6d6ccb1fcb4913ae6bba2e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SEVSZ1201101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0952664034d73ec31388deb9ee3f8cf39ba7f10cd23c2a202bacb96028213216. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/SEVSZ1201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89399a7aa8cc2a13cf959e11a0c30f15ec140e046ea2b960b9d238fc3e40d18c. 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/SEVSZ1201108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe406606205ffe81c01adc11f309647970fbb1abcb8b286579aeb5db0b650cf. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/SEVSZ1201110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72a89956e484c562400fad32eb098eeeb54dffd5e2027e3c28d45aa1a0ef39a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SEVSZ1200301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4963b2bb6c9e736051c211fe75e4f2b59bf12f07e1fb97f5b7151f0220663c45. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/SEVSZ1200310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4d0bbaa290c845397d71c8c182ba834996dbceed7f8e57a56895bb107db94f. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/SEVSZ1400601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ab94cc843140a5547e80ed1c7814cafe6b881e0c50eb5599fe6e3348880c91. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/SEVSZ1400610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef57cb7d7c94d07ee882f0e2eacbd0503951cdcfbce6d82e2bbee2108742f98. 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/SEVSZ1700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b360252d77cc525724c3946db745f7cef4eb8df78558b741fba1c26c389e79f. 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/SEVSZ1700202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3e3858d8d8a9496a00ca18f7ad52bcde8314a0f6156d3866cd365d951097c8. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/SEVSZ1700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4aee91a591c58cfcc7d17fc79dd5cbe4b10fb15dc8632812d4486231c4d797. 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/SEVSZ1201004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef57cb7d7c94d07ee882f0e2eacbd0503951cdcfbce6d82e2bbee2108742f98. 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/SEVSZ1700201.