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 0x4408f177ae7f7f37f1568434b2fecc952094fc4a0874d3e94b88ef1439e924d0. 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/f0fef8c1-10dd-4ad2-ba4c-649474a92249.json and https://artists.proofprofile.net/proofs/artist/f0fef8c1-10dd-4ad2-ba4c-649474a92249.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 0xe6d1a046c5e62cc46c827d839a3f5ced5c4a6bfa5031adc0fb9266eb1b884432. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:02:31Z), 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/COC010024464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa419898ba88a03891940f663317518ac20a42ee2156f98d06d75de833da9df40. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/COC010024461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760255339cf9979bb15ab303494f1b1a430c1ec56727fcb2c4135a5147221fa9. 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/COC010024467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4dc3b0f7bf86a599a4271f5df3b902c8cf0e509f544efa944cc2511e9f1c26. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/COC010024468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72e65e8d489ae54b0b807482ee65c52f8d7a6bc4eaa9174f26edc3e1a649097. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COC010024463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7eca8e0bfef885dd9c188659415aeaea981a501892f27bf3f0390578c7fda6a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/COC010024460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3f709c0fc9448087a5c126f6013172d8bd37a485587a53bd7a10586f9d43e5. 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/COC010125153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4937553aa76a8abff62996c7b6a02793f60d10ca784a95c964c38316326a8fb3. 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/COC010125154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d94060712296cb8c4dda0ccbc6a8a2aa9b429e65a195c6e350c524e0ec630f. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/COC010125155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded360bbda7efdc7d53d54e70479c7c55607294582596e26b4dee75898b8c87f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/COC010125157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcbfb70b39300f760573ef1983cb3a38147044281f71dc9f267b1560899b324. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:25:22Z), 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/COC010125158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dad9c1c465f79ea8c0d4a856c43680552da28248a80cc9b14765cd25000757. 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/COC010125159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9739a634cef349ede5d90847236f16259219c722208fe273016574a1de71ce9. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/COC010125160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872a23b9f44d3224cf359594082ca919a8d1bd7e4eb92d78af7fd20c2f1586d7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COC010125162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f10b3178f021be460fae3bf1783e8d0db1593652d27718f6704b729cc86f572. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:44:34Z), 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/COC010125165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9de0b44a129bfc7fca5bc8aa252f0ce3bf113337f0baf629d400c79e0dff50. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/COC010425792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4937553aa76a8abff62996c7b6a02793f60d10ca784a95c964c38316326a8fb3. 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/COC010125154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d0934c53b5ab1f0622c4de8e4e01100e38dbef668f020539994bb9f8cfcaaf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:23:52Z), 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/COC010425789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa05d5619aa454bed461f6d84a09debbeaa0eeb09a48147c651c6bcbe5604f44. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COC010425798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49d44c09cef71ff4fa05ec77ae3da7569528c852ca69c3c7349cfe7d9f220eb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/COC010425790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d03b0b16fb9bbb24bb6f39a2bd9e0288eae3c7705a0ce4bcb7e5bab17462083. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/COC010125156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4c55661c422cf0833a8d7a8fa670444647e9b7209dbfd255dffd84ebf94559. 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/COC010425796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138cd3d46e5f3455ef25c3291b81e54c7bcfd77b796dfabf17c99da54f691c8e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/COC010024462.