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 0x3541030d477953bbe9348de5bfbe3056ec3a298dd67e0238b4c1266c32b8ea04. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c183b34b-9336-4776-92c7-fe9f8022e94c.json and https://artists.proofprofile.net/proofs/artist/c183b34b-9336-4776-92c7-fe9f8022e94c.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 0xbf747cedd7299f832965a6d556f21f49e061d4ff779666e7ab9ef792ff07ec94. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ITJ791900047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597ad2559988145d29eb93db1f47b43109942b6de12cc55cd6d93654296ffad2. 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/ITJ791900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf85c1898b73f513c5cf04d34818cf7bd13a8a7f74d432ef980b6d7b755f75ee. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ITJ791900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a681f75657189bdc30def199d79948e384cd87ad45466ead5e7ef6dfe9c33ad. 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/ITJ791900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0339c47ac7b1b5cf352b9b8f11114477fb88356dee33ef0ce22974781ad7e75b. 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/ITJ791900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791790e062cca77a0f15858198087ed3437d7266c89e028605ad43219180b754. 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/ITJ791900049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf11e202b4162ffa3fd8e9a2b4db2feea12ef08192748328b122e0f4afb9b555. 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/ITJ791900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13811299e0f9c43497a2635569dd01c5b5423a0cd9be2272d73e7a9e8dad7f47. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ITJ791900033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda73d846c0bea3da829967a5323e7ca9b449db41bb254b17d7068ae8c9db389c. 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/ITJ792000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3680a93812de9ff4287aa980e385f9a6d8ba98d721281d6458c32ae24360e151. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ITJ792000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9758d2a57cf79d6c6f17ae622f6a521dcac31a281e65acec59c5f3815af178d5. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ITJ792000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202f0d07f41324b26e12da80ef40cd7a5fa1d305610364d17378a1ca2488e31c. 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/ITJ792000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f8e1d57c9a83827e05737be4a312f1f1594c08cafca237fa0f90a5f507251e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITJ792000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf255eebd5ebd951be6a32db393f3f8c7d7b11361a4b550ce3f7601b8da267a. 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/ITJ792000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266dd8a287bd9ca251ef9114760a46ef588afc44f14195d79d9e8c978252bd20. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ITJ792000045.