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 0xa1f5c6ba79dba834b4a969135f95bc1a639a6db84f5157c600478cd45c2f0edf. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ee5dfde-6541-48ef-b5d8-cc6501c2a52c.json and https://artists.proofprofile.net/proofs/artist/1ee5dfde-6541-48ef-b5d8-cc6501c2a52c.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 0x1bed58b1ff51fd695b34e6df54d2c29da672b218bbd665b4c2eb5284c839d369. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DEKB72050517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1eb523ca6ce4e6be04ff639a3e8ce56dd6a5ac4878dad5080f0b68921675752. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/US83Z2353102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ccef1949ac91fbefe579555d1ab861c84454756a254ee2bbb043da7ebd783e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/GBLV62315186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd811fe8bbf4cc8363d2bd4445493a23c381171e76eed5c5da1cefaecb6da134b. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/US83Z2498818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465f1c207008efba62e2f4925e21f7dbee954107957b7a573ba360c11bb5edaa. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US83Z2498819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e68cffc44fea4781fabc39559bae8489557f2f6654d62cfaba751ab081811e0. 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/US83Z2498821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4a87b095de97c1cfb0a9dfe1615d493515c50d34b8834ae512186ca4605e96. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZWV32456516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad279a6141601a3f46d6231d4ed1f9af63479d24a7ba6e276712b78105f9429. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZWV32456518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1887ecb005ed67a3c4eb12f488411ac04674d8a6082b3c8bb21025cf7ad4f604. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/US83Z2430353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7c86fc270db8335654af99ccef36f27a65eff51cd3d6ec79aedd8cb4231618. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/US83Z2430354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c159fea8b96a526b830817240c5d40381c5a21bfa2ccac5ec2fd303d94e674. 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/US83Z2506820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d771bfc0c120b655b79d8dc017250782421fb46eae06f9ffb11c8fcafb0025. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/US83Z2519309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d991a330c5eba5903f892b6d530905e110135340af10c524ada2a5c6c7ad1e. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/US83Z2515656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1f99922ce02a6c6ad732a51833b8856d217f182cf9030e29d0c498d1071736. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/US83Z2515654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5573905bcc6e9ed7f19b05d5af9a83afeb8bbe7bf27ba9a816c65b25990664a. 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/US83Z2495173.