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 0xee8b52f35c76bc94d1d3af15206c6857a5e54a65b0581baa783f27692b330b1a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53d91a4e-e1ff-4f44-94dd-6d3a7856599c.json and https://artists.proofprofile.net/proofs/artist/53d91a4e-e1ff-4f44-94dd-6d3a7856599c.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 0x4352808a947c55f7869d9034784b459848fe3d7a5e9bf5190c1edbfd4e3e36dd. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZES62580919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688119dea9559ec7a53d6cd0f7aec8850bac446922c7f7b88e5a23d4f84affbb. 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/QZDA82419917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7819e77c392872536e68e8a729975ec533498ee1a2e88ad6e2685e3f27f9aa0. 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/QZDA82419922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3af3b2c5b153dd0294b8e80fa955f52c4f1ef9a7073e9186f7aad13a25403e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZDA82419926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a9f51150fa4b026468664f13dba4de4ae70f6aaf5d94508d1f58afd498fa4a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZES62498567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3a516f6d04640ff124a1ca3985bcd32d56ab1f023cf6a2ad843c4eb06ae766. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES62492086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99b9fd751bcc04b0862e21e04234142d866ae54303e9718bcfad14c30b20934. 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/QZES62479509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82edb7d92e8e90f4f51964635f11a66d9ad695a432072e0394d59c512b05af0f. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZES62497775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2585ba6e96156c5bed1bb81b88596672f47dcbe8b33e6a2c1739d48a62f3fc69. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZES62487427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2089752c1f98ec52b24353ef9d09ca28a7e8da3090a0032d508054cc15f1fd9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZMEN2556342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29183785361aaed32bcfa94ad9d1572ffdd9ad2fd16e25fd2c97a74f4293cd3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEN2556327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcd1d96fd4c6777c054c43bdf79c56669f13a3baac7c91675994d48533ca105. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZMEN2556335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17dcc8414a2c514004418150687bd3c305380cc5179cf6877821a9a5bb41a60. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZMEN2556325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44aaefc2cbf3ef7e167c764927fb82c570738bf1c0d866788178381fd79f6cb. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZMEN2556345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fa8434e297757881e557ca7ea42f47a9eaf2bcd6bca5ed506f02dc374c454c. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZMEN2556333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b59a679180dd2f3fcff99b6ef44e94ec932ebb9836363ac535e7fbbea9a212. 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/QZMEN2556344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fea2da03504a48c2d1eca3f23d4c3ff9ae111774ce6489d208b124f5becba9. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZMEN2556330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676a2ba5689fe4a95ec65ed25ce4676ac55645c6684504c37d8baeeb745141cf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMEN2556322.