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 0x6266ddfd8fc059026fd863368c083f3ea8dcb1fbbd0826d6a41a9fe512ed86d0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf376ca7-2200-422a-882f-376a34af11f9.json and https://artists.proofprofile.net/proofs/artist/bf376ca7-2200-422a-882f-376a34af11f9.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 0x5c5ee6874a9cdd939a7955bfd5fb43229b765a95a8de253fd663bb2a34f59d5b. 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/GX8LE2598988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cd171f699ce2326d750dcf4582238a60dc06c8396f0b34ff983165ad1a2481. 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/GX8LE2593976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4470b161a5f27cd8bac6f9fa8ef5d4fedbf8466c8bb761f33884b10f9fb6df. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GX8LE2569752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484010b2cd662d37ef1bdf7f9e30bfda64335cb1e9d9db5811410b5956c81b14. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GX38U2529418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0308abd814d5ed65a13c5f63413edb0b0ac980c1af65e2eda6fead8b80a5bf1. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/GX38U2560779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18008d868d5f4457dc9ec421b47929403a7fc86673571a2ba697208b952d0db. 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/GX38U2540544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9195e04e867b5846cc7d48dc1baf79b506a4337c0b8ec6531b394cc3bfaa3e7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GX38U2525663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1fdd27263e37b1294f112030c28cc775cf03bfafab636ea63b6e87f741f061. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX3HH2518606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3854797958f0115d88eb32fbe559c22b0235ccb3aa61e01d1e505276b572178. 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/GX3HH2561605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482a494e544a0f091e7487674d30ff93fbe00b71634a40bf13fbea328d0cf907. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/GX3HH2543151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113d08ac548d5424a4f346b8931360d9eb7e65b8c4ec9752b2e2e32072263649. 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/GX3HH2555354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b0db0493703cf327c34cd7e30676ca2b94d83dc51dea5a68699ed07ac76972. 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/GX3HH2564066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f17b939cc90f7710a0599996f13836e55fa9714546b4ce136e558590ed2140b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GX3HH2538859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bb01b6558e57cbe623624520aa2824f53481cf342828c3aaed0e46067dfe79. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/GX3HH2571304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0746b960746a77e71af4bec360190019d308d255e68f26c8faa2591efc79ab9f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GX3HH2543316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81269352acf9f34d0984d88df4f8365f882523cd9d8320c32db2c6edd05bd7cf. 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/GX5MX2529668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cff6639da1b1065f13d8a27cd7c4cb0b3f30d8d53109aaba702f877b898a572. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GX5MX2591802.