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 0x559857a6594bf82fb2bab5f4b51505d7f64d9a324961313296c0498fd9391d18. 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/f023bdff-e92b-42d5-8983-599c88b3bc4c.json and https://artists.proofprofile.net/proofs/artist/f023bdff-e92b-42d5-8983-599c88b3bc4c.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 0x26c8c762f9b20d46485ddfe5bb611c7ddd542da2d8ed711deb86d07641cf7d3b. 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/QZDA62565496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca606cbb037774e0b8feeff22853ea0d23abd60760ac63b734922226a283ebd5. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZDA72595932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4061701e32a9e12f6b9993c3f0a6c5cc39437dbd32353b89387cbeae26579c7a. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZDA82508588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82272b88008a893435b934454d6a7c1aaee90155859bc58dd87b766568ea211. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZDA72598527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11e18aed1934d3e3b01416947c3bb89dcc3f33dfd4bdbee7f3845b065d39541. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZDA72598519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308d1b66692bc16e94d3ad74c8235a012f9eb9d9bc4f1e2a51ea342a1f4bcd96. 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/QZDA82510267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8706be6ad5311b42dfeed4e9cbcc210a8d2dbcc435d9acee80e0afe39d8a72. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZES52513194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467433e66e71465050201d57196c05d9b601e03aba804b0ec0ea73da2feba719. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZES52516208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3306b086ae61efeae9ebe3c3a2994abe20b999a967109cf2e4055b8bb38909. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZES52516137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418040c3b98168e913d44736f0096f7452aa3e58e7262b0337b3cd09b7dfb823. 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/QZES52518053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6827baf90e26144db3f17f618c507486b7efaa7ad57f3ff1786a4e5a5dfb090c. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZES62527276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda818e0be6cf40004ecd888616047c3a2a4b05f52b19a4c646d1a75f8a89e414. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZES62527277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6827baf90e26144db3f17f618c507486b7efaa7ad57f3ff1786a4e5a5dfb090c. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZES62527276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e0cc5fa02350571b0e3632b11721a2c3d6f254e955eb35b73fc7b26fa5f39e. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZES62534728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda818e0be6cf40004ecd888616047c3a2a4b05f52b19a4c646d1a75f8a89e414. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZES62527277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d43a09e081416f36849ee62fbed3ae11e76ec89f66a2eab9ca9f6c3ee58d12. 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/QZES72554704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a15b820108613f905a62902d58684340f473bd13efcf3da2cca05a07e926d0. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZES72559685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f700e574bab848d975cd89602412494a8ba95a2cecd95890d460f56aed6016. 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/QZES72561578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e0cc5fa02350571b0e3632b11721a2c3d6f254e955eb35b73fc7b26fa5f39e. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZES62534728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d43a09e081416f36849ee62fbed3ae11e76ec89f66a2eab9ca9f6c3ee58d12. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZES72554704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104dacd5e1e5ae9888176305e34e79f6720bce3efc82916d480b44a02290da9d. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZES72554706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c9a066f8fd8e77fb14b3649d3ffafd2f9445441c57698cb5a3fd2d2b7a7033. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZES72554709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104dacd5e1e5ae9888176305e34e79f6720bce3efc82916d480b44a02290da9d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZES72554706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c9a066f8fd8e77fb14b3649d3ffafd2f9445441c57698cb5a3fd2d2b7a7033. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZES72554709.