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 0x1a3033c6aeca639838e8942aa84553c108eece0f6164dd996f292e30e1d35169. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/724e5365-62a4-4e19-ad39-ee3abca7b33a.json and https://artists.proofprofile.net/proofs/artist/724e5365-62a4-4e19-ad39-ee3abca7b33a.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 0x3419a186782f1aeb5c0c95ff38455f2daa2b2029ec7cc8c70ac2b91c85889072. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLCK41050656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbde67ba457d404009fa0f9e0b3b585c7aba8c156cb081238ca8e5b2099e5b3a. 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/NLCK41042465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfde570e44b8ccd6d5d1350c47a50de637dd90eb44e2802d6168e14f996c6862. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:14:56Z), 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/NLCK41042466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91dd17e690d82d25e6c144d000eefe0a9d273bd433aeaf07ae9f5ec22e99b37. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:35:51Z), 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/NLCK41042467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e00265a8212785143d0d303d8e6f537ec8c2b23f3c5f481c792c0117bcce9dd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK41040133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4ffde08bbbde6a273b5ac6585f7b374833e41942e427f79509c6281b208a67. 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/NLCK41040134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69094f0ed9f74981c1d9192ef87f82a2ac2f41a07685dbc79f93211911a5d9ae. 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/NLCK41040135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe6fc0b3306787f60fdaab6e538cee13a36240d5d083879cd7839bb25e8bb41. 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/NLCK41040136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8a96971c28dfb4435aa637f19c93e343afbdd18819136ebcb9e95e43c00d2f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEH741653537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea28ec6b551d04818e369d934375bce6c47fdb6a5f2fff9e229a4146e2530fce. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEH741705148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95a580dc8f3642d945818a67fa316a4696a82b7e0def8230f7e25cb75d7c29d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEH741653539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51016bee9335f07a6ac98c66b1c7579b70cc245fa861ac7bbcd1dce3f6473cdb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLM791400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e3dfd78abc11e2233e8738ff1d9bb1ff02ddfb6193b44a4740f7f0748a8331. 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/NLM791400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c55c09956c8f592a9d1fa5040fdae20a1e990dceec24cdbdcd15258eb153e9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLM791900170.