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 0x89db5a413e4fccc2b587343f351682396669b2e92a53f4b40f061ff3c903de92. 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/fd62871c-aee4-44e2-b7bf-7c99b2f7509b.json and https://artists.proofprofile.net/proofs/artist/fd62871c-aee4-44e2-b7bf-7c99b2f7509b.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 0x14fb1e1feedf747c006dc0b9eb493db91701475a8658eb00531526d3d864fd82. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FR59R2285840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c600ab48cf0d197d3351367790dc75b23513f6118c4ce560e248a4e3ece87f. 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/QM4TX1589243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecda2f51582783026f019ae959a0e2d7bac929aafd964506a532f099e535ea9. 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/FR10S1948667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e926c946b4997281155486c11a756037e6e93a3d2f4df2f8fffd204ce21db3a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FR10S1948668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b433e9a22849cc8181a86c28265ba656d7876ad3ba4a32847133c589b72a51. 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/FR10S1948669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cec957c3150a91b45c46cb8d6d33a60cc3dd5b3a504fc9fb734a4ca931aa878. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR10S1948670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec15fafbfda0eac8e2ab78fbabacc5af7e10ac41484dc30af33df113b6d72845. 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/FR10S1948671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1085683466c3c85d1b3a6037c753f8388be126c2dc666df21969545878369728. 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/FR2X41855884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f79d419233c885d4d72a657222e95408a616488b37b596028bd1007f6b800d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA062045473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55186b6f76475fa15516f5fa897bbfcb99cb2fdf56a7c512697181e921377067. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DGA062045474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04de262855af6b3918d2fa9923e3649dba97cc9e3dc686c4c6d7917feb0f30d. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/DGA062039463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127867fe435115782b2d1aed30b410461d00948adac72c960525e81208a87386. 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/DGA062039233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36557436e84e3daa2c0bc8e1e6ad3256a204691f7949692c25e706447042f23d. 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/DGA062045475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f75536c926424cdeb2ba7c23cc2651c78de7e34f77e91bd8504b5cda671b48. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DGA062045476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aebd6f704b896893ce0d7ff28e5c849e5dfb06790a2abe9a164ec53dbb9e723. 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/DGA062045478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895ccfd02fde9be380eb7a514d8a3c38a5f4b0d243b2d9a62ac60889bda4cc14. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA062045480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5b3d67143de860f344ec81e750ca6d17411662f30d1f383d81b96f49bcbf7f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/RUA1D2373511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff823ec11599e8a4daf4a3bba431ac4d919940a1368312932d03bf4079621d3. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/RUA1D2373513.