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 0x8e1a445fe8d6b1ab2cf4f2611a936d105523caea7a7c444c72baee237630fc85. 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/f78367fe-5b61-416b-bb98-08d20f2496df.json and https://artists.proofprofile.net/proofs/artist/f78367fe-5b61-416b-bb98-08d20f2496df.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 0xd8e489e188f112602c5567b1994b9dc1a3a968f3a9e8c43de73254dfbc4e2470. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/BEZ050000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61212c05de13c6c195618771dbc1206f8f723de67e7146191f866d768a35e979. 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/BEZ050000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f18bfb9b57e196bcc6ab030d2123b33866c73b7dd3bae20f41aa3e9ed11f2b. 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/BEZ050000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ba4a8db5ead094a1f9b54e3b619a0967be808e0da30a658121ec0018bf932f. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/BEZ050000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c74c16a5f38320d07b694cffea54658a8d267842c651102449403aaaabe9e93. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/BEZ050000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf091e176b05f5a23f9dec33c6aa37eee6579dfdc257ed07e20a714545a544739. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/BEZ050000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7887a48231da2fee5ba2659ec4654d733c41dc0ce537a753d2062f3e313c227. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/BEZ050000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c472e0e30216791b181424461137a2dbdc133fe363fbc112aeda2e0fe73a4b. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/BEZ050000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d80aa1d4ff87471a9c36309d57f6e5561870b06a54712288a53e2be419d04b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/BEZ050000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8731b1ada419446fae7687591352fcaeb320f1af58851debbfdeb244842aad8d. 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/BEZ050000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f3ff1dee43525cebc759fe64f3b98bd7a491782565ea786c0abfd912320358. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BEZ050000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa286ce3106b360cf6353fa5087bf8cb2d5697d2980bd98d5fe638ff7e61487c4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BEZ050000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ae6ba5746de4a8a2da11beed8e45f70bb23d023ae5c48052b55c9f46caed3a. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/BEZ059900045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42df7f9f7d2a979aca8a826baca603ae0c9821be52645c5e12963e8f98a47c7c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/BEZ050000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a91749ff7d77c8a096cccb702cf524a4d37acccc80c1378b91cad69e30a820c. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/BEZ050000020.