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 0xcb3900fc898b076aac8d71cc0fd74c4701666949800d507fbeb32145af2aac0a. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65676cb2-80df-46c2-995e-f1b0cadc18f5.json and https://artists.proofprofile.net/proofs/artist/65676cb2-80df-46c2-995e-f1b0cadc18f5.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 0x937c462f163d75e5bad670b24e962f1b2c9165527f727da0f583bb8462573be7. 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/HKG732419676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f90639435bb8b5fa51f05c0cae2dbabc513aa3b2d39c4e0dd1da784e7177c4. 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/HKG732373403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d824c4bef9ea20a5c14bd9e8040bac0b49703a0754465e963e35d2e2051c3a. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DGA062336599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7674a6bda1fae67b73f9fb723d6fc2e89a4843dcf45deb8ca7e2d16e9a87e9b4. 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/DGA062330631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6e5c93efd484a7bde9ce7488768f58949c7a3235de99967ca76bc04c7df754. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DGA052316231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2080e47e7125f7aa7ed6fcedd088edf9d536568e665670f919395a0043b599e1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DGA052314265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de39a775160279dc15768f7eeef87c730d1eeed1b1386c549e742328dd38ec7. 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/FRX762386714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb793441bf7d28668ed91761f3c949282314d282dc6b6960c28c74e994b4bd1. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/FRX762337126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c4a813420dd7010ffb3d06b44817d1442c53a00ab63d59e83b6b009fe72d8f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FRX762337019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f104472ce160417840bb8bd1854fb53c99a5f2d2f5435fa3fa1e557c824f7d0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX282359159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c239449d1b56da5e0dd0fca0be316b67440fdb899e15e7679ef7ecd51fdfab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX282358510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54167711f1500fb595138a7b6b06e15991c3c60763430a7c219767b8ff7d8b2d. 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/FR96X2347870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a63f0e50b4cb3b74830a8e2d1822f3ff92b3aeb80a1dbe3e53ce8932d7e27a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR96X2347740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59771940f51a6b8a6c284b8e8d01f7ce26a3516baf49adff734d72d18db8ac2f. 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/FR59R2313930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843bfd6b67f415ca28dd79ea89b9030980d136ff1342dd2c39b96ddf1e229b0e. 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/FR2X42364875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b91a6556bc07b67a05a6fbcdcceaf07aa33b70add4e234207d2c7b04bc75a0. 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/HKD012370070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaf4a687b8b531f15eaff7a900b402be7c8869cff2d86f34e41ad2ad775796b. 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/ESA012478865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc57a2fc4dd72141277f25c6f52c5267e6f43fffa2b29b634e5db60769627d2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ESA012474009.