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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df0c5752b265e316a5e4e905be4f9ffc592c82f7c43a6be53e2627a8945a4df. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4c1d6e2-00df-477a-b0b0-0b5aa2f98612.json and https://artists.proofprofile.net/proofs/artist/f4c1d6e2-00df-477a-b0b0-0b5aa2f98612.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed494120fbce80610f05138aaeef039f2f0058bec0b4d8e65dd23e144e7da9d9. 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/CH6541875175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022d0fa667f8f96843b9998bf6250f513f871bc7c657084d12d6dfddb01e34b6. 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/CH6541875176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab0234f18c9ce9e5a9f2f46b8104e6caa00667580f7c4e551416ddff9b5642e. 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/CH6541875178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36add022cb2bff734808ff1869a0b917545c0f0ea5f3380beb3bc7890e16dc0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CH6541875172.
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 0xd77d93c7078a25338883b0802a32840869a0453d5a70464dc46fa4be2bd0d04e. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CH6541875173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39a59f5fbd7f8c6714ece30e0a6fb6b8b4fabd1ffe56785200046fec8d53af2. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/CH6541875174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fa9fdb8c19693ebfa133b972df01e5c5c7ef797aebb420ab38c36432fdc8bd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCADR1895657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab9002be226e820dca46405dd5e123290913ca58f469b450c5ee21c50195447. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/CH6541875177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebad98ae5fcddc0090ca1c3417e7cb1d8fce431b7c1c3dbbed79ea851004227. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CH6541875180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bae77ef2d4e40a4c55e1f67e64c5bf51ce9a57c27f393181c8ca052ffffc3aa. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:45:28Z), 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/TCACR1674252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46c550dfa8ae78a2ed513a0c8abe4c5c093d08a92a13c5d4b4c09f48052e787. 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/TCACR1674779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c07ba1503adbebab6dae9031d7074922881b5588112c43ff5d17c37e016182. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-21T20:34:55Z), 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/TCACR1665581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586c4b7b8d6119eae76af95e155130d78aab438e7fb0963863d52f5ab3b958e4. 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/TCACR1665575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ce5548275a3c070d3e985965d0b4683e25f75caf3e8d7d87220d5d91a0b6c8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCADZ1842832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90154decb626c6ffaa8c2181e5a04035b3d054a998fa55a3175572cc072e1209. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/IT7LD2500715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853bfecebebfcf1e806a91c9a52b29cd67ac58c6233be2afdcf39b896e85d605. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/TCACR1665577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd284ae23326b3e19ff75be6e66e5abed83fe1c584ee7552a2d122d803175037e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TCACR1665585.