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 0x42bda624573f183c147257c22e864bbcb18657266bef596476c4b13f6b574a44. 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/cbc057f4-5fc2-42b7-98e9-240a350ed88c.json and https://artists.proofprofile.net/proofs/artist/cbc057f4-5fc2-42b7-98e9-240a350ed88c.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 0xb884250baa7f86bc3234567991f29790fc2e7c41748965688228e825b1232487. 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/QZFZ42521408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f1d41bbe7fc84eaf6c53cf51c061dc897e222d4fc0fa5e48d2aa2aecf2f69b. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CA5KR2514233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb153322c304e0398cb98fedaeb3f80db5328e04911c408d776e9473adbf28547. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN42563574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c66bb5fc2a34e33169fc21b6fea3a847c49378596b07f8f5be8bf223942bc7. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHNB2515174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c66bb5fc2a34e33169fc21b6fea3a847c49378596b07f8f5be8bf223942bc7. 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/QZHNB2515174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9374a7ddc9cc69b250bcccb9cb277f364a4d86f10814c6e5f0a07ce862cc41a5. 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/CA5KR2524142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f1d41bbe7fc84eaf6c53cf51c061dc897e222d4fc0fa5e48d2aa2aecf2f69b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CA5KR2514233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb77dcaf46a116064c30a8f600d7105dd35c515cfa0ec7a097bba83f27fe831c. 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/CA5KR2526889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2b21fbcd386eba9f786f8c46d44cf86155592f7d064fd11061420090349b94. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/CA5KR2526891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85840ef21f1a42f45a12ee2578c503eaac1f8e1d6c3e852e48c492c7b8fd4ddd. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZZ7M2449189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba14d02dcf0dc0121b7356fb8ded62454f2e6e722a66970f1d49a6d64a5e0504. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/CA5KR2536580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52d179128d713e82f5b86a8a776c1b4e448bd15d652de1c2c8683ab9da0d577. 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/CA5KR2537607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf022462b88a9ec64d24db05df6538903dd8b4e9acdc8e939c5b7d9f6d40c24e. 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/CA5KR2543826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93b711dc3272c5afcf2e232ad310f171d601fca2a450b78f95ba048f4f476c6. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/CA5KR2546653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5371c598d4ca8a9126ef7912c80ffa987db586eba5954ed1c5516f548f0ec217. 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/CA5KR2589128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27524110b4beecb3f8c3dd8f8705981784ab05a6b51d5a73e70176fbc83ed7e3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CA5KR2592378.