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 0xc92eb7318b498dea0ea26d7299a614cf268c3e5ad3cb14b09d6338d8f31fec2d. 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/4953f97a-f4ef-4ad3-9602-870ee9de13fe.json and https://artists.proofprofile.net/proofs/artist/4953f97a-f4ef-4ad3-9602-870ee9de13fe.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 0xb67a0de3373a6ae34adc7ac58fb7d36591bceea0b97aeb1cf262fb3aa859637a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USJJX2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5e3d3595e13b126ebc9bd581a3dcda9c01895e3e4605387cf23e2651cedb06. 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/USJJX2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30555984c1e73cd925e245d7d4af2ce53715a1f0b5db2670574af16e754d3c98. 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/USJJX2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579babe4388c39fe092f5c50cbaf7d1e968f457959779e1aee94d79671cae353. 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/USJJX2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ac2caf42a2bb357453d06ca318a75f011a37ebc96d810ba8fc89711666adf8. 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/USJJX2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b30e0f3e5e1f77b9d119f6d012c278c280ecf3dc76f20e36397a2a99d54eb8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USJJX2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac38806ecf99a71819bee35ad9ae70b927d315d1e4b0639b5c56ff80aaf43c3. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USJJX2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f54bffcb81b0fe3c10ea6cf4444979d76feccd1f01e9cd5bcea0ebd321151a. 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/USJJX2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26724bccbca3ce1e18da3fe38574700a7521a1b7e09237233f1c2b48bba244a. 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/QMANG2251249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f9b4f68dda044b8ffdde5eacdaa726532116b05e48dffd6faf8a17b6c6b2c9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USJJX2300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ac2caf42a2bb357453d06ca318a75f011a37ebc96d810ba8fc89711666adf8. 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/USJJX2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0024fa38b6e9f5cb6b555410a9176d3c6bf4f3afe3b208a434aacddf6ba7af5. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US3DF2469607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5c6b4ef9c24bea9e5ebb435d94e57e90deac4573918e53b2846ccc64d21547. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/US3DF2469608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e56b9fca8a051f1114d432549914ce29246ba205d4d67350dd6c3a939704ea6. 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/US3DF2469605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2155dffc4cfbe2b5d0be12d66909578dea2805a57f4fc00a6df63932c1284e69. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/US3DF2460979.