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 0xc7e9380fe91020474f58acbaaaaf5be1b83b853e97fea9c700b68d60bb57df75. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c88214db-3acb-4d2d-8284-2cf62677fd20.json and https://artists.proofprofile.net/proofs/artist/c88214db-3acb-4d2d-8284-2cf62677fd20.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 0x07f1c1fd3d8b8a679b1464b6348b1277a663c72580b6b034836ec9e6a8f0816b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEVZT2300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe040d9e7fdd1da5f2551d4a53c6a2a69bfbdfb11d7e5b422a5d54069c0c1bb36. 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/SEVZT2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff65c8ac5b2ec46186b0c05ddf9e79ca69cb01e35128c5f058d06dde097c743. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SEVZT2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9f39ec6b2e72bb9d970ead3f9720e04d254921569ae25d04b0fd7dc5ef6adb. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/SEVZT2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84e3ae14354289ee61eab237760f599b92a339da74ed950ccf774b6b18b5699. 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/SEVZT2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2d565eb36715f415187a9b6c80c2bdd59748f20aeccba6d82725c29cf0dcea. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/SEVZT2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6acdfc6189c0c5b6337851f8781a97442ce376254537ad526cb9cbca7c74c1c. 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/SEVZT2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf714930e500b803a0884be0a173d4e2951ad39452f71fe00986c8919e707d0. 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/SEVZT2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e9945006b2a985baf123e70aaca3c7461d7cf9bfdb4e4903bc0ec130cb87df. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SEVZT2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa7db8d87d673d8f5142cb7032b069c05dd0b3f76d9aae4e77009d5650feb9f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/SEVZT2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae577a86fd9de178e8704c2c76f6a0ea2b3e815bb6880f49a818734aba64037f. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/SEVZT2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad5811c3f08053ca311e7f47b85ef0abf77f9f001d47c1f562831b5e05845d0. 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/SEVZT2300012.