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 0xe1998f1e385814ff14300e3c6f74e4e10ad51b0257e8631cea52d3f55901f74e. 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/f9f7416c-a694-41af-a310-0da552fd5398.json and https://artists.proofprofile.net/proofs/artist/f9f7416c-a694-41af-a310-0da552fd5398.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 0x25154b24a3236eba243b652438ce6feffa815247e23b440e0afb6ea1ec75ed4b. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFZ62452031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0937227337937a31e47ba0debdfcdc72efc8639d0295b9b1f1cb57427f8df9b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGN2285127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f18c5bb52a06570f2a6126737a0230efcf8e1fde5f638409ee312230a69574. 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/USHM22176614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74e63e1dacbbd10ef8b1f3ea96e4f0460b10a028aaff9d7eb0cf86396664a57. 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/TCAFD2082360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92aa073fd6a1772291edfb8e58be7cbb841ec7a4cf742509fec225c29e9392c5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4R1932778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fed291d319e199e62569920a04241075e4fb5d82ebab31adb5612eb13b384b. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USHM21822611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33686f75d62e49d90207b5168334dbbda700c40a2d972d7474ebdd852921b71. 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/USHM82432759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96dd8137f0a601301284b7ce319b769f37ae4e014d03b9843b06c8e0eedd25d3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USHM82432760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019a763b61512b8b5f6f18cce7096316681a4211c7db691a68080d77a5e1ef9d. 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/USHM82432761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f9e2f2c6375e1e6c321b47ea487ce56589f225c2f053c5a5d27b893b16d286. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USHM82432762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6801e9e92f0f1a460182255441fa2050913890b557bca735bf9f4b25b6fb22. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USHM82432764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd65071066b9c412507be1cfa92e7d88314fd93f89cbb90458b8d36e53d715ab. 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/USHM82432766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f7a63e31a3a7aeeab0cd5f3ffdf4bbf8c0e907ee5b1ac8aca9449f5000ecd9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NL1AP2009793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb753ab3cd12a554424a9413fc32c8652f0a5bb746c280ee541124eda1a5f6c4d. 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/NL1AP2009795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcf7fd1575c483e3e4958eb89d838f4431f8779d02c94aa56dbbfe4e904e8ec. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NL1AP2009797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3382158fba6f24a5d367caf0fff79ebe0837275a1c535cbd0a904d61a1bd0f. 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/NL1AP2009798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b92c3a01c4b6350e902900d3f10335ffb815e5e486bfd2c88b4c74b1ec14f6. 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/NL1AP2009799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8325a8abf550fc97a8237bdd8627a7101be0d4ce52f36b21c21a141c2292ba. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL1AP2009801.