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 0x1df1905d9d42adbc44853547b37b08e4abb80ccd35c17b71be2418a247afe57a. 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/a5121c8a-fed6-42c3-8a22-c27a4a6c1337.json and https://artists.proofprofile.net/proofs/artist/a5121c8a-fed6-42c3-8a22-c27a4a6c1337.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 0x030c57aa4e5dd16cce499b67fe51d53645d2bd0e93f587388f213156ccbdf880. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHN92280516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777c9efb23378871a6fb21bdbce14e7171a16f488065c89db2cda79fad6ef4fd. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZHN92232861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e884dce34b93824a79acd11e2c46498581dd977e239cca4ed160eb0802a0b8. 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/QZHN92237949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc6649ad9ab7750561da44785a6964c1c6602aea125202130263a2561a7d419. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6J2224193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc080d93f82983292180ff9b1ae75c75a774a51c0704426f4d6cda92b20076ddf. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/QZK6F2243440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4040febe9bd2df176d6138d82376af38f1a550533d088b45342bf464e3b913ec. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAT2246468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538d7a3033f6ce73b613e37ccf0c52389c68dac9e4e978366ac3dacdf3660f6d. 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/QZTAU2242387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538d7a3033f6ce73b613e37ccf0c52389c68dac9e4e978366ac3dacdf3660f6d. 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/QZTAU2242387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fa1b00af18bb8da34e905b678bcf51c159727fe3ebff187f6d266d5faa4521. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZTB32217573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc45fff3eb06b4f086652ae973080e10b63ccbe80ac121a5ecdc656d06c77c8. 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/QZTB52224606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6119de447899cfdf0259df3bfeb416d59011dbd6bb0a4b244b8e6ed2c75b09. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6M2398367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efb94934ca5d9b60dd2a59f07ee126d9de0b12a0f3d9c33e948b83673da99f7. 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/QZK6M2375111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac0926100983d1e4ec5e73ca5e58b762b7b893b5fc98e787b55bc09002975df. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6M2374485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c9167adc712120f9a865e07dfd2d8f055915580b34c9403a09848c4deeb74d. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZRP42356417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13806d228623b52eb760fb57d602a2b54b240554b08ef280ccdbf6ca9925b421. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/QZTBF2325756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13650df900a8c44e6ef398887ae2de76fc5dfac24fa8da828e090dfa9900462. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFE2378560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2761a74e1182bf37d416f771df4e914306a11b5ebbbc365a66f4e038d4abfa5c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTBF2576471.