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 0xc89bbccf43be55aecc30ee0e8d0f565d070a0936b6a1ed035d89a0b80471bd9e. 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/909443de-0f98-4d40-a703-b3f73b3c6479.json and https://artists.proofprofile.net/proofs/artist/909443de-0f98-4d40-a703-b3f73b3c6479.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 0x28cdde473f20f378554d39f0c6fe33f9adde11abb3ad5046e07ea7c46e9ae5aa. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZF452023052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1bd3f46f9325a956aec9eeb6ac4c1236b01868a74cc0a7e8823eadf265c27e8. 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/QZF452023053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59bd07d68d650dc389e84928e5447b22e25a6cecd757d3e18beee21e4b30561. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZF452023054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6937e7a53aec4cf70bbc3bc8c118b7f4d1caf46912e2692641a261ee8627e8. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZF452023055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf28f1ccea9293dcf72b4ea7883c5c88c38a3ef9267d265a5f47f1857a2bb2f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZF452023056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241b34bd1910ca0873c3f4eb85d47411574dcf2866ae18536ec5ec541887561b. 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/QZF452023057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d18f05bd5459a901dcdfb08d113ed2aeff3157135c3ae23f5d65cad0ff9012. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZF452023058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60ed9a76bd219e7f24b9ccda8d16921d50b5c8f1acbdc5bc80c7a4a998969b2. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZF452023060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd8b2fe17ef7e7596ae66bfe3bc8b8c4a7b905d9ea38f2a0f913f00a55fb295. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZF452023061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31973ba59702f520ac9cd50c8d738f95b24a8998fd50d53eba9a9e3b0bb491dd. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZF452023062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2571eb75ff7006eb2a473bb51f3484c99263f2de5101ae20e3adaacdabdfa90. 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/QZF452023066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6824b42a0aba7b3a5219b4ec3a01e865630015d7eae9db48d9c70bb01102d77. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZF452023067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dc5d58e9cbb35366236420375dd697076b251dac5aabe30ea39cc636ac6911. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZF452023068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39697ab2f50090db261811074578d16bd539da90d75798c431a568ec01b505c6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZF452023069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42f9552f1abce5599bc1213ba44f8c8496711b69a339d114a557a573b30e309. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZF452023070.
Brahms : Brahms’ Lullaby (Arr.for piano by furupang)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c29614412e92fec27c86df370ec14c9db7c93596720e6a459acdb396a0ca3c9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/KSA012203924.