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 0x1593a31823936d372ad7909cf5f685506a2836d11f289b3093c0f6e7d87355e4. 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/f12d7dd2-f80a-4088-8828-13aa6a296202.json and https://artists.proofprofile.net/proofs/artist/f12d7dd2-f80a-4088-8828-13aa6a296202.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 0x95292f331ae49e57dd7995814256348afeca92e12cbce6c74689eabbcf5dea5d. 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/USHM20645132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1443eb8c4bcb2a71bb9de311efc6d4f3c160fe6baa3db8f51e58ff039d22ba1. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCAFU2136897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35487f2369f2a74a2352aeb67883e103eac9a37475d0485d67b56df8082936ac. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAGL2287844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae1a0389df5c4d2101ae9d535fd765fd88894f6979514a86deae1764e879d1b. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USME32300797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b4034d7fe1df40a66ce8199df2363db86a79b42f991106004d94802e273c88. 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/USME32300798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5822dc6d7067da584ca95d02a628f642c52333c5d6df76c6cf2243c8d8318adc. 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/USME32300799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2252f249506f98cec7bf76983033fb2fbb685274234a73939a024c39061602. 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/USME32300800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde104779f4b7a6d8a7c314a4e7c4316387a671177c5bb359503d470e7c040154. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USME32300801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4897359b6e336c9f82c89ab41134dd66bd17e57bb33a3bc81c596035797fe3. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USME32300802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb8f04f21bd31880e750a92dc6143ae678de3968fb80c4fe5f7b8b8186572db. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USME32300803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4073532c598c2b715529ecaec6f251efc058448f133c67e3748ce7081d2cbab. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USME32300804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5545b06c32fa73f4e28ae57b53be30e602f97ff8272f685aae69c7b76d507ab. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USME32300805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfc34a6730baca16c70d961a87b0617f81cffdefb781e2eb6a78455dea6b314. 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/USME32300806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b4110f63e6930215d62466ed7225c93b4245ec7174bbe926a9c04e48f21338. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USME32300807.