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 0x9f53aeb4ef338a6924a11563745031e835141f08ab049890681193c72781d928. 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/908c9a0a-588b-4075-b471-065d24992d8c.json and https://artists.proofprofile.net/proofs/artist/908c9a0a-588b-4075-b471-065d24992d8c.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 0xe818673e0047a7ba7a65c2a564806d6e2a41f83a7f8b342aff76df18f46b4f63. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZTB22270337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55ce9697f818ab807f79d84541f510b4a3d0f36b1f091c7330d25068700bfef. 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/QZTB22270339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22229974089b3ad212681d190f4d52d8ccc8aa7a3600a759e7d4bb8104ddb0ca. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:41:17Z), 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/QZTB22270340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b04a67d727a30fbe7a086ce594b9a60b433c0909aea5de0253e1027a94f657e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:07:10Z), 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/QZTB22270341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8cd2dceea1837342ac7cbaa6964cde1a19d7255494f5f61c99c8e2c4356289. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:38:14Z), 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/QZTB22270346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0949f8ba08eaf4312b3031e8062edc64d5c1d7178250c3008c37757c80db4d0. 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/QZHN62307934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f923e19c4368216f00fbedfd803d5396775e4b5aa72432aeba707f6a520d244. 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/QZK6P2351402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ba1718f9f8ed80a118e40f40401c8a436f8ffaadaf18cf069f373eee0351bc. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/CZH442300111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5fb4122b395c7e7e5900e9f3a7c31140eeeadae42073d372cd23f168cf3402. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:59:18Z), 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/QZNWQ2368879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0981b8f71fef36a78df4e72d7944eba5e9abe25889e2dcd9fa057b87bc1af28. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZYFZ2425354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff94ef16aac8dd889d4e8dfe9bd5f2d23e91640a6baf1b09394b526052c9041. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZYFZ2425355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643c9bbcafa1c9839f3604905b3401a437d2c223175d9c7299de82e5821c0318. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZYFZ2461871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d39ef3288ab8858d11346911888dea39303fa0f6d1a74ffeddfad601e747972. 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/QZYFZ2461873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e64bf5b7eec5aef5c8a33fd9987ec89ae9a9dcb695d6e9370090ce2896eb64a. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:09:19Z), 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/QZYFZ2461876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9946a132bc1fe9abdf4ea227193790b51d49387470ebd0db30c2099c9cd02596. 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/QZWDW2429805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe28d6842d93a0ebdb1a172be59cbe6e70c04a8c678b8285a2472c6cbb4077f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:12:27Z), 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/QZWDW2582858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a5ae7ff6bbefe935caf3ae0a2d7b1e08e1e8dfe17f5da239286aa8b69d821a. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZYFZ2500676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa1d4b831351f013aea1d6a3ea425d9a4f2d6498d001ce3990a24c22b22a841. 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/QZZ662342748.