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 0xc954dc28b643f80a15d8b8aced66a41bc25b64b85a08737bb257e092c8077b28. 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/a1fb7bb1-23f0-4f1c-b6b8-6516ba269b65.json and https://artists.proofprofile.net/proofs/artist/a1fb7bb1-23f0-4f1c-b6b8-6516ba269b65.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 0xc5dcf1df78664fe609ea849463ca53a67a864fd4d606b649e28331ece3614012. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCADI1785704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70faec72879e401f26a70d8038c75b6f84327f104c422f2d49c11aa59a87dfc2. 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/TCADI1785709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9455bf89f694af1e1ea5b0bad352c5323e6ac7db28827a104cca370b4c932f6b. 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/TCADI1785718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b674842ad3546a3497ae0b538b43eddeff3e805d17e2fe0aada7c69ef33cd4. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCADI1785723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342922a53619a5e28d0db9f4f2ef6fe3f65df0d08192cc20dcc7e93133bf8f78. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCADQ1802459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6582f7d5c0317ba88c95006b97a4285c9e13914159a7ef8528c0df251cc53834. 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/TCADP1827382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ca4f0870e9f535d2ecc7bac48c846bd3c46568c9f45489d4dc501b16bbd48e. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCADP1899858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4341588d4d4295edc66a3945d237f93488ab07acac21c6bb3c3bf9c8ac42269c. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/DEN961900651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbd8a9594f564ee843cc81fbccdecded7e8cd82d6782c895a8331711556cf61. 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/SE6HN1922302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3855ec24b85139f179372d3e8ea5298ad3bb1a7d1783dffdad3d5f63ed1d1380. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/SE6A92038691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5040a7fa86a3e7854042ac5686a32588a4ba7ef238d6d4224905d93bae9a6d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE6I32024364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00c390330afc33db85bc27295045e0a5194279598f87d452a72cdfd0b9fddc4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE6I32024309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5368341e177feb1d3cbcd90222e5d0a21c4b62d6bb0cf374b014ddd5326df7d7. 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/USUM72209834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdbcf9c1c47c81c0ec70842a0b11882f7fe1687bccbaf8566b0dbcd0652dbdb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USUM72305610.
I Thought About Death, About Time (Nightfall Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fb36073a5ce87b467714a75d5685e3080100643b42cf1e73e94b45afeca902. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/SE6HN2484634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac576b8aaf2667d7891922f92e7557b812b299ab49a5475caf41c2963130f6ec. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE5BU2596782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ea13721f2de5ed9f73f2e60e3795e479a3e8bd860b49599962b6e8aefc0c65. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USUM72305052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879be5eddc987bef390f5191725d451cc436f9cd843f4aec8be37f5265e7bc39. 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/SEXCG2100211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75f55e5f95ab5e800f7159722f9a2c47d7e096df2109a6a23322c19a660690f. 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/GBEWA1702981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4c75419725113c720788b470cae53d0d6cde12d11436239a00f9cfa8c4c1e1. 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/GBEWA1703226.