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 0x146eb8c5edc990a9e9a695930b7c39e2221121036b06bda2daebf88dd3d3940d. 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/4cb1a72f-dd2c-43c5-b6e2-c5496e4c6d15.json and https://artists.proofprofile.net/proofs/artist/4cb1a72f-dd2c-43c5-b6e2-c5496e4c6d15.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 0x4f7354ff7e60f79c88d0c6c138734301a073a071f95ffd6d472122b6e827d995. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:35:12Z), 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/QZK6P2310717.
Por Menos (Smallest Circle Spanish Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424808c20858ed08d8a7097c621ee81f2b958a9aee0caa5766d4edacb4f92fe0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZPLS2395543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f44bd5f14547852aa2c35dd67387cf0c4d002df6d942cb8747b6053c45f947b. 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/QZDA82482080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a91e3ea1029489b0f2b6bd5f6cec28dafd4f4c9950a33687e0437ed2c2b1c9. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:40:47Z), 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/QZTB92420627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64711531c2ad8272e74477530c08044d35f8e6acf61d5a77e8d08074f63845bb. 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/QZK6P2546219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbadd9a5a9d5309bc97919edde5be88bb22603d4e5281c2d19356ef9ee92bef. 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/QZK6J2553055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54b6d7357a8ea3c61b5f80b618f4377388e61605e5234aec1091e61f6821258. 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/QZK6J2553056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbd5f37aed8b8cabd994752ec14e4e32e096420107e21b54deb8073d1f82843. 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/QZK6J2553057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc239854ee72094397d351291e2ef75c2ced57859440bbdbe8bd6226a7e9e11. 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/QZDA52509705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751aefc892aaf8cb9a49ae3347917d2901f1798b289586afd79e113c9b910221. 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/QZK6J2553058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64711531c2ad8272e74477530c08044d35f8e6acf61d5a77e8d08074f63845bb. 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/QZK6P2546219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8473aa7739597ee02be30bec9837a4057c85ce915f376c545d99efe55962b535. 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/QZNWX2554416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586c6b1a553599b2e298dfe2cffa037d9875b92ddbb150d4e27f053c6fdb9da5. 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/QZMEP2431243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb53a6ed95e6635abd151631caf48b389264c72216fb69701469156da04bfa9. 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/QZTB32437460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a5e8788ba447e86e19eb6ddf4cf4df29b46bb43706f5410baa82a97f44a5b5. 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/QZTBB2206708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6939a1d1cbe3b9a48a5edf4b9ebe39add681a9bcf26327a3fa96b10b2cf15246. 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/QMFMF2415988.