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 0xc6d144194f8dd4eeb68750c3de35bfc45d347eae7822366035d415836d1b6379. 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/77bd4ca7-d8b3-4cbe-9414-7d9e1bef924a.json and https://artists.proofprofile.net/proofs/artist/77bd4ca7-d8b3-4cbe-9414-7d9e1bef924a.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 0x294827034592ffa4f91539f7e603e09b03cc10b5323be753b6884075197c15d1. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZDA61866932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca0a8d5a3f91e64861ad1f1f5085112c775c65a40de2a3baccd5370a21e905a. 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/QZDA61866934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28985c730b128dd4bb3e45309e73ca8efe6d4dc1c3ae69fcf2be04632e04062d. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZDA61866935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9113485de6f29f099b3de2151769ec4b48417c5c2b92341698df25b81c76b24f. 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/UST8K1804272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f2b7682189e231680544c4a5f742e3b82914418c4d98728914a5841fadfabb. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZDA81987931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70387fd97113624eb8838e8bb293ffa38683a7ca13106ccdf08796875a1a4108. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZMEM2053189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc111f9fdc17cf03ef97d3e8af6643de69548220fe8679a3871ce03fd053d382d. 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/QMFME2159117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb6eff25061bc5c9529a8d1656d5b55950482687fde65c6954720e0532fee24. 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/QZRPB2158998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900248caa0045fd4866186774d7ee8545aa43a924efbf8f6cf357aceb0d00fb2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMEQ2280647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1722b5f690c85dfd16952c6f9ee20724f4ea61f7c3f4dfab48414d17640607e1. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZJRC2285224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d3cefdad2b90c70af95424590b04e1b650171670d72a3b9f4d1d4c7eacfec2. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWR2357207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ced781f893febfb82e04c21eed07381662843243d92c2620d72557082b4ad9. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTB92408024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f100aa26023626b747f0924ec3f6ebbc4e412bb1ba693d5b043392deb8e91a. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZWFG2405079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02d480dabf08fe6fe65cfb21fe5ad80f74c72fbcd8e231dc4ea6451bae0f9ac. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFG2405080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de4bd289ad9bc15730da7bffc793caa3c0cb17e0edd089f922ce2e9479e6a25. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZWFG2405081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f57d7447d55a1f426ddf839f1a55da8cb4be3f860cd542b2046519cda0f2e9b. 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/QZWFN2576005.