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 0xfc12f766e1eb06fa35d12d12d4370abba3c4df263b817a72204ee11df566996f. 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/1bcb1b64-346b-4377-9af4-90a2cf74309c.json and https://artists.proofprofile.net/proofs/artist/1bcb1b64-346b-4377-9af4-90a2cf74309c.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 0x1a650308c53bebaf8df201cdae35a7cad210858e813679e462fda374c1cc45c2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR96X2187777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7727b68fe3de815bcb597e2827c01aa78706cc05dc8503f8f1685619defddd0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR96X2187778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cf4e0b440b42aa73adbf5e09ec002939ebdedfcf334bb2af28bc5ba5472225. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR96X2187779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2223bd49d8fab6ac9eef918afefee9eb5af77300bf2eddfb9e3c508840decb0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR96X2187780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824b93992bd7dc927247d3695a54ba68e15a836be38a47d5233d5ae5fb8aabea. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:42:42Z), 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/FRX852501331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc815853f61072037893021c3ec85bf659e4e7558a63985a9137d6a585cfdbc. 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/QZDA81915584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cf9b063f39729f94c14304bb2896958ed229bd206646033bf0b6c9a9336b80. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12141225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44062e6fb576fceb4a65f4f95e4d9117b7613efd7078ec95d9268cde5138c6a5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR7JQ1900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8fa63e4818baba1856e21d1e2310a91803903ffb5872d0cd0839c18de4a11f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X42494368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81e013bed5beaa1b98ed002c7417b2d4e8a17d46ce390a59d36caecb4060a52. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR2X42494370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675076241ff20ac7e24140c76626176aa97b395e44b1d7657c75469838914f63. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X42494372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d68dd428caba605fda479d62aefd2461b3ecb6d4f5c1a14c6b8f60c49d9382. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR96X2134196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665e6df086f0618c9fe16ef17a96ae69fa8a9a11cf313111981e107d849a4da0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X41988182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc204e9837a5aeb27b624de58091b1c95ca31219dc93d4ef4b44a223b28a52a8f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X41988185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea90623e2c70030847097142b9c63d23b6eeabd1eddcb7a76ccaa2d2e35b6979. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX202223845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c22f0b38e2960f343e91e82d3b14749914745ad838d64c0e7c9741bf79dbccb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX201773210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b900165150bab5f8a38147969acf2f3f8f6bc41db48cc63a96d6631c73a9c46. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W11607845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81e013bed5beaa1b98ed002c7417b2d4e8a17d46ce390a59d36caecb4060a52. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X42494370.