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 0xa60d7f149071492617aeadef45e615cc9db2f2572cfebf59e2cb92fb093836f4. 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/405bf6f0-535b-4886-a847-02f926f902ed.json and https://artists.proofprofile.net/proofs/artist/405bf6f0-535b-4886-a847-02f926f902ed.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 0xe5440291ccf02c7f7771c44c4f304baf565562d0a25ad277ec56dab373bfd1c0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMPKX1725624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2ece5f05efa224d0668c3f9a6b4fc8c917e1121c2994d0146f476de2b1236e. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/UST8K1730740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8fc7338f2ba0149f24145faf4c59ff01815187e2560554b8ed9b2c048c2fcd. 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/UST8K1730741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3a836be35a0d08b7bf5035c27b67eb766de32f97bacd47b311985ed75803fa. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZARB1809741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc8eb18161fb1fd927729bd6a562145de8b45d38f3178b3ff9bd8e420e9534b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZARB1809746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e15eab94955744ae986b079ea492795675457358e4a2b3344023d7e9c40aa66. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZDA71873072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02526a80e3100103d33f453af3f883e6eaaba8593bb13999b0bbcd54fda122bf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM2PV1879639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5efa16b5b92d4cee3ed4685437c8fb6026a9c2bd121723d48f6df5db3b6512d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ61918605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557b051aa1c16d8477b27be97dde20683ae6b9727ad847980490b59a97f9d42f. 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/QZHNB1909273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99711e2f77ff1d140f04beac07e43577d2109a80b11ba29a79df00b23d82699. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZFYW2014017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2de482773d5a001c584bbdfd7e3b7d3343527f455564ef480ee123337da692. 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/QZDA62008172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe572ccf4fb4823f97dd1530be94800afc4219e71a038759d5e2c2644e72159ea. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZDA72074666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b7f258a1554c952057bb4f42726d79702e357368f5e230e64d6646d3d1a7f3. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QM24S2101208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a1d515d91fdc3a336eb48ab15f93a608e6883072298e644dac891231a987c1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UKXN22200206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948ef51da18dc154d9e2df4e557b7906d41a076408e0ac06e202c4f783be93c3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKXN22263433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eab73545a2523127af3ef6c30b7fcd758bd9caa561e3b84cfa5688850eb0103. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/GBLFP2325628.