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 0x9e6871141d14f4ff9d631bda5ad2fe0fdddf64f92ebd2557e7e8bea8bb43ad1c. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/592a9547-26d5-4f20-b591-b29af6fd153e.json and https://artists.proofprofile.net/proofs/artist/592a9547-26d5-4f20-b591-b29af6fd153e.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 0x2d0ada535d1efb205bb0bfbd4076e2ea04f84497b9cd419d6c991ec21c21930f. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/USL4Q2085077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38925caa25b13c978f708035458619d419523b95ec94bf6ef0c0dfb7d7c47441. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USL4Q2084874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4c7dec7d63452b874f0e82bdd74df22b4546f67cedb36431bdd13a932ddc83. 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/USL4Q2084875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c438d9cb3f08b41dc02c412499af7d36077b9e0ea01863cc90c99788b927da4. 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/USL4Q2084876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475163a670a805ea4b848dc8c985004885690360ddba3644242917dcc5c321f4. 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/USL4Q2084877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5ed5d829b905d7c8781c25b23fcc1c626cc4b789c2e51f9a4658cffe9969e2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USL4Q2084878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d3acc46352ae9a2ea605401b820d58fc8ec2fa8653bc0f2ff67d8d35d157f7. 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/USL4Q2084879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7381a91fa8edfd1c3cb63e2f88dc0d9f31c1156260d05da0b6fa29f18b137e. 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/USL4Q2084880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d1520e77eebdd986d5e6cd89210353285f0ac47a5d3f836f1a26b48c5d7482. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USL4Q2084881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056edf0e45511ccf6b53a2f47f9f72bd125eccbe0e014415aca80df743238517. 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/USL4Q2084882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab54b62ad87dcac7ffb1df594f1b8cc97756d4db0cbb3eab15a38df62b2dc47. 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/USL4Q2084883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b032f5183b6c3e6edf0b419c94cda01260c55046a1bddd43466f441e8b41b29. 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/USL4Q2084884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52856c6256632be7affdb88cdb9896e921c27ec11e3c5b8aa538e72b7bbb2774. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USL4Q2084885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aeb701e69b5df05759e4d579e274d136606a6dd7f332fe9c8bb72c795daf0b. 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/USL4Q2084886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e884039cf301765b3ebac2c9cf986b0d414dc854d64a01f03129b83ab7425a5. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USL4Q2084887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fbebf13522fbb5ab1486738839707167ed476d9bad20b1698d5a472ed3a546. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USL4Q2084888.