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 0x740e9b9984e440fc5886f8c65b4c24e38129ccc3ae9846934591d93fcd7eb0a1. 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/b1b8b4df-41ec-4afc-baa9-f8491007da40.json and https://artists.proofprofile.net/proofs/artist/b1b8b4df-41ec-4afc-baa9-f8491007da40.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 0x30ecaf09b323a1e61bba67fe5b191a298bd4c7cde661e526ff842e6fdee5466c. 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/GX4R52446250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231a3f3005f9a9eb3bb4d3e6929fd0b1d42d92c24f6771633f7344b3c63e0b82. 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/SE6HN2470694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2856790059a2aa40b39a77b86b5f6f14b72d813930bc5847a32159fdf03f88a2. 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/DEPI82416376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e498b1cfa9a28c095ce6f1264f1068bfc8bd68ecc0120013ea28b3c6990620f. 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/NL2QC2101445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7534a8de4a4195602c584900bb89c896530928ef35a9363c07da743452ea9b2. 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/SE5BU2488140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92879860caee20217ca1e42d0d4215a211f6817d7aab6958a409166a5c804a33. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE5BU2488116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fab05bed6ac29512c9cce707c957b42cdcc5baeb024a4f8622e5ff2e22d1dfa. 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/SE5BU2464011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfa0daf3c00fd4490493bc3608a34d32b21210441b90dd1017d1b5969e76a8c. 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/US38Y2418574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acd1f022b51f625e299604d7c79a171a9a95ab8ecb5ac0875f19fd904f5bf6a. 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/GBSXS2200304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86c268020b4c810a8e64575b702492603d375134947964760f26c0b54c0d0db. 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/DEPI82503890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443c9e0af3586f350ec14fd5219bc1c81e21589b9851196eacea0d498e6fe08e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6XY2506200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95c6b3e51633d003b7c628a15b338abdf9bc75b7aa927f314428c4e5263a72b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBLLT2504381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0770d96aaa1cbbdb3864e11ec66985241837351e9b2d90eab47c015b4c82983e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6XW2412892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccb69f4c9b3e9b8ae1e316f4a34f22ce193a38d256be25a7ea56af3e1cfb1c7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6SA2484870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96707d77722da634ae92201b6535b0e437fe3bdec206b36973592ff9a7fc5f29. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL2QC2101564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffada6de5bdc37fcbc45996dcdc20e0bbe37e157c3e8d3fd9223d386b8d75d5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX4R52466377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae654965558cf0e8ee766d4a5816a5add8ce5f423a91ee6be34ddec5856bd44a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GXBDS2465049.