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 0x5361833527a81b6841695b6a2bf2c93c09f12eba63cb8df81a5b98e774fbf94c. 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/5cd02429-f28e-4d57-9bcc-0b30fc3c9338.json and https://artists.proofprofile.net/proofs/artist/5cd02429-f28e-4d57-9bcc-0b30fc3c9338.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 0x77729c098f94dd6407904ff6ad2ff167ec7dd237871995e8e1c4ac2dbab14af1. 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/BEEG61800201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09997bcad5c42d985feffaa25007d4069a2bb25a04c23b90b9c0441f724ea736. 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/BEEG61800202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd602960f11b0a42c06113dbb8f73d53affa26485e6f66aa9c9d5f61346d26839. 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/BEEG61800203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbdf6064a1c14f7bba28f32a74e881896fe41e33a68e8eedd65ca34483e7017a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BEEG61800204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a11256c2713b51715be646c92840ad7d3075704ce27b1c8c9f3d3d7a9616f5a. 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/BEEG61800205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c05b9ad0ddba349a421782a169eb6bcc81c886d8fef09b83c9f6ae492f7fb42. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/BEEG61800206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd074a0889bb8357a6d3e9bbad9d6f546fe290a5315e11a8dd6e575e2e19f7108. 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/BEEG61800207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe825052964c3070180a56183f76db089e5efc61ca53054205eb218981522f9c. 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/BEEG61800208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce9c213144697e991bb36612323bddefd50c7514e35a4c6dde055c00efbc0cb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BEEG61800209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571158d01aacda8422a10f4e8e534830338c9cfddd8b1342de49659f308c8818. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BEEG61800210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae231c4d098c7d0c040b8377b254b5c4f9b0eccc608387149fd773a0acb38fe0. 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/QMFMF1458264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30bfb3fe1d13b7deaea9417bfff408b86da92df66372a6369df1bc0718025aa. 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/QMFMF1458265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794542b659e8880dbfc1ab9353cc6c69522ad39952a0dafd05fa696bdbd97dcf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMFMF1458266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbe0e1afa3b2f0d6220a82691b837aae5eb05146d658e2b58da19f0a8c23a81. 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/QMFMF1458267.
Nights in Trossin / Retour des Hirondelles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68e5534b40d0a53f317b27098f1b12aef3689f5eef856d63ac6fb69d93285d1. 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/QMFMF1458268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6e406f21b211b2581bf5398a1ea1765cbb0e3528860da42e26886ceac2b509. 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/QMFMF1458269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e71ad021bba768ad4920bfbd28ed02f3fd96653b4ebe3fa4cde8ed3fa0a0e4b. 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/QMFMF1458270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c63a3d13ebee0a4a6b8487345dc83f7a1ad326cb3b3ba50a82c1f6547ae931f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMFMF1458271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3437ed5ecc8997da84079a51a5cc50cdb255e74f707feb34ad6b6e2bf1c53e52. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMFMF1458272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada5c6672ba71c67deee1f95d233ce7abe8f0deb9a32164a004551143ca54542. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMFMF1458273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb254dd19a43aa26e7ce0b103c95aa58b454b324e6edf93eabc005da9533175ce. 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/QMFMF1458274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644e97db4e82e30613617c84714469be7dfec55d36e5d958dd784eb9368651c2. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QMFMF1458275.