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 0xe83e3822c3f2d9d32ef975bae00ad8f630a96946178d6e59d428d365447ac6d1. 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/4e1a30fe-7213-4cb6-bdaa-ae0c2841a321.json and https://artists.proofprofile.net/proofs/artist/4e1a30fe-7213-4cb6-bdaa-ae0c2841a321.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 0x0cf51d9f8c49f17117c23c8fac9bf0bec4233282e2c202bf5bba7a6eaffff314. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZNWY2187236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0941ca947f9d6244f65ec76a40493c1d503ac9c61e46733eb9b747c9c9cf62. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/CAHQJ2204614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a5be88d47f7203e63c61f7e055a8730439ef3f8b0c829cac774c2feb2e1833. 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/AUBEC2237205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b624fc4e865e3baca834e8e971b79950f87a0b6ccdb628a7fd4c8baa0712d4. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZMHK2350974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc2a6a5c9602305de060cf0c4fd36da29e6a185d806319ad5b781f15c65a8d3. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/AUBEC2310768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a74cf0cf61a151f09935e3631f52013ca5c9040332f40098ee1c32ced5fe61e. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/AUBEC2310841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd723245cae837a6e2ada1964e2c0a0b75e26201741aed1c8487a5875a572596. 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/AUBEC2319303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c5708f92bb91d7791bb6ef6bbf964ec4114cd473784f92951a40d4da03e4d3. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/AUBEC2317870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae61f4dbb9549428147e19a04c5a3b9b9780f926a9bdd7c1d9352d9959d10fd. 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/CAHQJ2204625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669e20d1dc152232b4e8dc5d32c08cd566341eb5689d05711f5928295113f7f8. 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/CAHQJ2210762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96511cce5700db75df29b1b079b8d9bb4406a225b311ff84bec3e0d5155d1f7c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/AUBEC2341351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a413e3164b97dfeaae19acfe376547d60a2990ff2e7e0c24a532cbf32ea29b. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/AUBEC2401159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4603e77abbd5de7858fa0c5ce6d7fb062a08f98979a346a3ccb8c29a3d6743f8. 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/AUBEC2483844.