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 0xeacece78df0a6eee77c43ea0ed852c31a494dc831a2f968db72554118f35e204. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91d47c38-6630-4174-abca-d42f69765d6c.json and https://artists.proofprofile.net/proofs/artist/91d47c38-6630-4174-abca-d42f69765d6c.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 0x30629ddf14ae0d8bd283c9ee4181447a2f4aec43d4422cc804d6106f9a62c698. 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/NLC8K1400325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd61e05a75743ce591a71ec3858520ca6b5760817a7b4ea9758616e1fabe3e19. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLCK42220275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef28d0cdf03bc58251c923aa1a02a87e3759518b66ee98c2a3961630aba74906. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/UK6491400139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fb98034cc2e22b8fef223b648b2c629aeb16c941c6f50ac1134a2b1eb5b725. 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/NLCK42406814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28542bc4daebf21915eb18a13586c712c8888099f51870428a1cc892ae8e353d. 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/NLCK42503049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ca06cc728f1851450148df4bf6f18fcc028b642081526779fb0b98a47af7c7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLCK42503050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8b5dfab719c38922ad1670adf83829cc2840868b7816a0865b535a67b228b1. 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/NLCK42503051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d396edc63743e5c7ae386afd8a19e7c44b86852d1408af4c41cdc174503db2. 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/NLCK42503052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3437e5cc708c50a48b89c7c500a302dea09fd69218c1ac401006d002f3978c50. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLCK42503055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca75a36e2df2749f7072bc8bd225904064302c983f874e75a2bfae6febe29340. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/DEH742510492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ecba4c285da9ef428e99f38c4379a1fcd88953831167e486c1399cae45a345. 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/CH6542554998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8013e7ab41697c99edcb47f44c20a727a5c0b074498ac452e47e74e036713553. 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/CH6542554997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8b6cdd2189be390259ebcb8675f3f6712d2a7ee1d65de59ab615e714616cbe. 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/CH6542554996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf48d2d7d5bf4aaa0b204ab824fbabc495de5648ab0057f41373f1bb86a03f66. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLCK42217419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b08884b9b6c854adbfbcc7ca374b9991e464c4ebab78a53026ecfd0306ece2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLCK42409255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d82e12926bb5f657a2cee008ca8035ef278be07a6d10ea50e1d1139a5c89c4. 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/GBEXH2401917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb41bb8ccd08d735d62643b3c4092d92c48d89544d90c908210220e054ace51. 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/GX3Q92574994.