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 0xce291a6fc454b07e929625c9a91faccff4937195da91a86258eca3d055fa9880. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2895c11-1672-44c6-8c3b-1583d69550f6.json and https://artists.proofprofile.net/proofs/artist/b2895c11-1672-44c6-8c3b-1583d69550f6.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 0x76bfb373d84a628f95ea8428fbb761273612445be1aba1e12307f9e212d1f222. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UST8K1573741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bb6cd6c4c83bbd8eb962f6750cf4fac2222128af47e95bf78f6bffaefd6868. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/UST8K1573742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a8563d587b8d6b962df7f82feb53809224ff446c0003664263a522ad337ec2. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UST8K1573743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d9e3a7b572808fea30fcb8f48325163721f2ceb372e0129f1875a86ff45820. 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/UST8K1573744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308d0f4620f00855a5405be723ea65915cdf5efaa51909d570aa3116dc4ca451. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/UST8K1573745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2f02a583b93ca9cfb5d6e159582fbf85660456c608214d4184f76a4293117e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UST8K1573746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afd36517e9c8f6858a795d8d348e22b236a7cd445296feb5074f5e180d3a302. 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/UST8K1573747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71169df6a8675de735fccc0980fac042f65ee103973f0f3df4c2758e88081661. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/UST8K1689513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91266f66131dd21bd687fd32286726d13c969f959513e6b1788a11ff1df0086a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/UST8K1548135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c69dc1150f9915558dab5cfa0165d87af892367e74c57da96d53eba7f92987. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/UST8K1548136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869d9478c49214b8bd232ef41fde79bc3c32c73967d4d34ef98f25161a590071. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/UST8K1548137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d68c4d2203ea2a4825f2d8aad670f46eeae9754e796a97d4f3f0c10089720f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UST8K1548143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639ad34ea160fadf19882110764c087065b248aa1869060e56bf55a2390f6ed5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/UST8K1548144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d70e1b649b71aabd0bfd70f742c2178d801d027e365d470a0db52ed5bcaa21c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/UST8K1548145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f345b3666003faf9077c8b77b97a4ee6abf20b0f5367ef6c00053296e84a42. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/UST8K1548146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001c627fe7bbe7731fa8b1a95ea46b21d546523f58e892b8205968c4edcca238. 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/UST8K1548573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c4710c09fda55ffa4138c0c90171288918f70abbb438ef9182ac8a8bb7f74a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/UST8K1548574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb544ee2e5abc8e9b7a97293aa727d23b17c922fddcb24ef1f1a3429ca3b078eb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/UST8K1548575.