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 0x67bfd62c768cb459d893f0871937d9a033be98905346ea8466fc1fcaf11ec452. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa6420fd-8d66-4263-b43c-6068b8ac8941.json and https://artists.proofprofile.net/proofs/artist/fa6420fd-8d66-4263-b43c-6068b8ac8941.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 0xeb74d230accdbddd7a7c1aa9cd462b3828132a7bcf5952021d119091f30f4003. 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/HKD012477712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581451ba7e9cefac5c428ca75a3ef06069e7c4c59154412ba2768d4174861667. 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/HKD012487117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433de30a2ae03ea792179ea44bc3af72bea8675d4de1a653479610084a58b99a. 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/HKD012490560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8909ffbdb96d328a63a443ea982796b72a8c43c7f8291bf2ae5b16e605efa3d9. 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/HKD012496298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc1b26abaf1abe09ad091b02675e90e502d4b32709a41ef7ffe710f83f66c7f. 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/HKD012498552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe929f087decb4a9979656f7c29a3a5061624995cc492cc12de3685ece2a8b9. 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/HKD012508119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50aa880b0b09b5fa0bac5933a85b7b8f8777cb98881453411a64dec667cf5ad6. 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/HKD012508452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff388075e4f2ab2884a3e45e4f7f3e4e4834e3988f2a1b829b21a6afd62882d. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/HKD012509819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e91585fd8a04d6dd828d3709722b72a9001c2236706d9563221d8056646425. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/HKD012521260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0c9c2ec6ec65a80fdb19689c3bd8a0759e1c53fe7291bcf6b50bf78000e025. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/HKD012521618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904265eececf04389148198f02f9bb32a20646aef7aab505a3a2af97d5e311f4. 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/HKD012554305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79abf9511766283b8bdc5c6f6086cf8eddf6696bd0e58a39c2ecc241ba287b9. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/HKD012544982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb477fd8d7709082de5b12a9e2e4ccaea5641a814d85bef96a9aa72a121645c81. 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/HKD012553202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e9a250cf06c74a17afe0b6e5449d218767679b846d8c94cd78478e3408f595. 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/HKD012556891.