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 0x605b2f465e24e3cc3dbe61eedf3db8dbe49fe24bfae1c2bfec62e4ad1a80c009. 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/983adb97-1a36-4c70-94e8-fef86507801a.json and https://artists.proofprofile.net/proofs/artist/983adb97-1a36-4c70-94e8-fef86507801a.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 0x01bd2028cbec638ab3d3b87858e7693b19cdd94f37243e5a54dfaf5391f6df84. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/UKZJ72100211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dfc46df496cc64a9858bf33d47edf1e75de95ec363d6489068fd78698160b4. 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/UKZJ72100213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80b9f47f23caf29c12d762ccd110c052eda08cf94b4fe4079559440defd7cf7. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/UKZJ72100217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b36c266459e4cee29a20dd961929600c4fdb41709dcdb9a91266d845b74d80. 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/UKZJ72100212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5a3d367834a5edf314d4d0ff81543bde6d9f8aea45c2e739ca0b5f84902212. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/UKZJ72200254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e606628eef836dd6131278394914c58e2a78848283533ccb3bb5349b28e1565. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/UKZJ72200245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283ef63bb05339501952d35270c2bfab8d745e4c93e7fa0f86dc5f335d6bbe3f. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/UKZJ72200246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9862a49b0ed4f372c618fc50ed0b49802adeaf2b7ddefa793db167f7a7800e7d. 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/UKZJ72200250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39113bdd239fc0c5d34665dcc81022e780f6fa3eb96ff2dbb54bd85b5e82a018. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/UKZJ72200244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66132948ba10de6e36508930f60ab1dedd70e9f2602530e7aa5ff929f9dbe61a. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/UKZJ72201161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29d2678ab7257eb572e3b2921ec0c0e5e94bdae7a3a79ae2e9aa826b3e5d95e. 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/UKZJ72201154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbbc7ae0c8216daf2014e8810bec34002347366a0143aa4ec9f17f409d42a79. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/UKZJ72201153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee4a0c7197018fa97f9b01580574e3f5ddec0e8018883292cef230bd3e54bcf. 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/UKZJ72201156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25009d8132acc06a38f544be649a65b0c139e2b8bc0f63ad55519c88d1595a90. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/UKZJ72201157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81355c4926334381baff22be35dddf329bc62fc62091e3273ce0e53b0298a27. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/UKZJ72201158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612b26cf9395d8ef9cd9466081fd0aff5af4746ca14f815ff9620bd6a37ccb9f. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/UKZJ72201160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e9e4f003a07e6c33af341aa64d4f3ecc6d8716a28bec4599e5112aa3f7e469. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/UKZJ72201162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6216bde078fe47d46a3358e7495408aca498f1020eb7dda8d871f3c1006d71a. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/UKZJ72201163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d5ed5afcd6bda2d6acb8179be43cabd3839987306aeca0ee3eb94d5e62283d. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/UKZJ72400606.