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 0x4925c4dbd7974d8c81bc5e0f63a1ec0f601749bf264025a4a30f3df7fb7232f7. 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/033fdb38-a215-4b35-bb90-9a9962de35df.json and https://artists.proofprofile.net/proofs/artist/033fdb38-a215-4b35-bb90-9a9962de35df.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 0xafd72de0624e2e26f5c3ca1be5e7df207cf4196e6989cf7a09d9d260ecff1782. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/PKA0N2000998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1eda8e7a8e2782202522af6cff16db8683a05e77df6d80d02a5e11ad56eb65. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/PKA0N2108371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ff569835a6f69ab74a4fe85163a3d3084f5d7b45ffaca750f2d97d892f501c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/PKA0N2101187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7981a6566009cce545bf756374ffe1be5566a77a28251a7aa04e973a41c0c3d. 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/INE182224540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9427ed2cb02af60d7387e83045c3dfb3e511a1c95248e510b0692f04216a14. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/INE182224541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ae7ab151e256ac918b2972a780479830fce15bed4bfe81bf6e25e6393207e6. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/INE182225219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac2ac72e242d95cbce993571e328695c44fefccf3ec6e44f0edd529b05f121a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/INE182225215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff4942f75d9c8d567321ba66be08d67ad59153545e433f0ffa7f1944a700f13. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/INE182225256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94302116d2a51eae1f8916241ad7cd10e84a356a1e881028071ff937911607d8. 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/DGA0L2492887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd3f4fccfd311e330c273adb7085bece152d7475edc6adc787d3482d8974976. 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/INE182300056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83b807c59fd715b2242532aea00f965ec219cee5ccbea207b2e8816d1b0fc43. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/INE182310805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7f95577fc2251977b98fb42dfa6261586a2fbc54484ed0e39c3fe1e7242f46. Chain 2 (Bitcoin): anchored in block 957632 (2026-07-12T00:10:15Z), 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/INE182320599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd4555b4b35726f15b81d0350d808b4c58534f867d41685ed87738b979672f2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZRP42387054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ba3201b1f6cce5d7d889e1f5fbbf0cb766f4aa69689490c1ec8ca82313d848. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/INE182330075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8592dfc412c1f67334878f61b2f256e72e045db1b45f926aadf79123330ed647. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/INV902401117.