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 0x7155f75f26cea3d1799d74b0fcfa13011e9ac441ced63bf784343ec70b930597. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3dcdd9cf-9ae1-4e59-ab6b-c554534971d2.json and https://artists.proofprofile.net/proofs/artist/3dcdd9cf-9ae1-4e59-ab6b-c554534971d2.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 0x93c96b3126d4cd1e95a9e78498bf53a8b6effbb4884e82c6952feb127717c24f. 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/UKQJK1800046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef6b334d2b4bed8e204eaeea9e3e816f7ed56c45a47db804dacf2f4655ecfd2. 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/QZHN52072630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdf55fb62dad2dee7eca194599e5a9e1dc49baa454a543701e575c094c7c702. 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/US25L2400215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd20ad00f0b2de4c04f158ad1358ee9dd13de8570693bb09ed9b9529c4f1d498. 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/US25L2400216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151a11240789fe8c7debbd68ed172a04e85178364dd0e3531cac5cae3d796951. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/US25L2400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd360e77497255165270fbd73f6b6ba790c7f2da72217eb85e2c3d85e01929e0. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/US25L2400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e16915af06072bfd8f40537b05de1fa3ac71c596bf4bda7b740b13898e6d3b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/US25L2400174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8742067587ebc0a2094cd44ca00bd3bc751495ed6f99a2ed7ffe7181b85d365. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/US25L2400217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921eb7ad6f58fa39542291f55cf9b3b3b6391f75b84fe1d70a7dfeb72f16179f. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/US25L2400218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c91b6841b4c709f58f859b84548ece45e2a48bf9154ed6cdf983826025ff160. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/US25L2400219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340a85b41171e9534c41c7295749fb51b7e2ef7a2100324d11d0a6c51ede9296. 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/US25L2400220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff120d9951f641846ec0b4a7c8ed5dab467da2b26cafd06b3da0f88f6f40a271. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/US25L2400221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b17ba6709c4881a5fae633c91da10f4f4fabed039f1be84d485cc760376d077. 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/US25L2400222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f69d7af7742de60d8f4c8e1a217803cd44df2139f248c8710cd8de90c8aab3. 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/US25L2400223.