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 0xd940a0dd15682f0383998e7c0e9fcc6718401a45cc53cf790ecc578d311d3492. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc7b4e4d-7be0-4213-8bad-dedce3a4646f.json and https://artists.proofprofile.net/proofs/artist/bc7b4e4d-7be0-4213-8bad-dedce3a4646f.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 0x5c1759cfd160f751c6a9d7ff369b5ec977dc3491881f2ef832a7e00e92da871c. 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/GX53U2369490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360fa4ac39ba4edd11e807c13c794b1ff48123c58b1a0a8a424fc8753793690d. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/GX53U2369492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594d063df3f327e5dee487855f752221666ae2c64eb718be8b51c495ada87dd7. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/SE6SA2403281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd251b8c96bbbef966425031ba4b747c98ccf9c2cc1819dc4b406bebae1b233c. 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/SE6SA2403282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824f3bb0d680b0e954b9cc98254f45b20ff971ebe94014cc436d135423d499da. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/SE6SA2403283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1830a8d8a17604637f5979f2677e12e2ee7ec0a537443ac0e0b6c3c3a0cb35b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEZC62587732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692bde68f0d56d5dddd4dde613ac4c2dc0714b7c3423767fbd6692a6a00e964e. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/DEZC62587733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d17488984f9a5d3ef492b3c7c01e689d9e5deac9ae9ea936d379b10fa4b629c. 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/DEZC62587734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbffb3338e428493fc9dc1a2c07a70b8ef4201f20f4af442b7714403ebd995d. 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/DEZC62587735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc435384b5a87c7c233fcc35d47cf2f8e7206704319c178cca66b44be3cece5a. 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/DEZC62587736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ad9a5003d1082055cc6b9ffd94a0e8eb7162b9421253212b6df8b18164abc9. 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/GX4R52545118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573bc3b2c290b59d7f571ed6ee658eeaf9572f45d94c0a235757be2a84b3c250. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/GX4R52563623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb8dcc1a986d9f4d868d108c3b7bb37a89beaedffcf21dbe5df9c6dab723c2e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GX4R52511976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126e3a1a31686677aed7a32b8c80eae8bdc93c360cfbc6b86759f742469646b2. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/GX4R52538596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba340db77f1c6612808460271fc541de42dd5888153da37ac95abf258e9e09e. 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/GX4R52596391.