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 0xaccbe0b8033a906b5c0c32adfa3f18a3da4978a6ebf76d1cce709e922995a7c3. 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/81831880-e0fb-42ba-994c-0dd405890750.json and https://artists.proofprofile.net/proofs/artist/81831880-e0fb-42ba-994c-0dd405890750.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 0x2182e11dab83f713447f1eef727c97663b98851d102acb085a8b11c366b22df2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NL4WT2200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172e8cfd7cdf5514fea63f69a9b841f854f0757e33ee4d7a2e2fc5d96d27c417. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NL4WT2200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a3f4c59769e8ba43df9c7b4c358659f0795d2e9a3dac9a77ac2a120ceaf620. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/NL4WT2200238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6892c52b8af757c65c5b1a89d236ef32bdd61f70674e55a4592ae16fe042321. 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/NL4WT2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f55665ff26388ae5f2cd53dd60bce9b9a4afbbfa2bc9eb004ca840e549293aa. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NL4WT2300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b6d74bc590dfb602419731c4afe304812440081783c62b1467bb58b6e36802. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QM4TX2389609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe638387c9fbab2d96754a9137e9da4af36d706f0195961f2a53969bc2f0b30aa. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM6MZ2305002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b07b667f407dfa6dddb16931627c2111f27b6424d0d7dcd6170ec1ccbd2450d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QM6MZ2393186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cb0afb0b7b00e885fa15c946db2b890fccd4c357bcaede9086084811579610. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NL4WT2300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f07656760504499cba82085bb8f63fd586f67f34fd1560c1e6ed2ce1dc094d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NL4WT2300226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413e71e439c3bd3e5725a9c81101cfd99fe542a9afa37c40f4bb656a2a3dd206. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/NL4WT2300243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85e6b4518c7a8c7e14602bd71d92fbdf52c05c3c8ffed02678c730f81c3749e. 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/NL4WT2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a3dc5162dd5fe1dcd14d04aae3730525fc016f3912a776597bbc017cffab87. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NL4WT2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb8b80aef59c0188e57462f10a86737568f221c864fdf4b89b812ceee9335cf. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/NL4WT2400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cea53ff825b91cf5f4e50184a4ae045889ac5b6f8854b750f5c3d46fc2c5f93. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NL4WT2300328.