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 0x43d53e54a491f6d1a250e4bb6b33c21a4230e9363bf161f7f96b0190c3c87500. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4af1dacd-f801-4528-bf33-c07739400339.json and https://artists.proofprofile.net/proofs/artist/4af1dacd-f801-4528-bf33-c07739400339.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 0x6b56630b4c31e097f8e1dc6cd673b08199507ef667286c82827c31ca1e164877. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN31947065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0f74fe8ff6c0371c719f99cb5bf854dc73371b0433366929af2245d2cb09f1. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZFZ52105563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100a4ddbab01b7d8da1977a4450dbabce5034d4f8bbf7b21a8ef97a7f08a1c86. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USUYG1452083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdfe02f0a905316ce83dd607f6b5152b5470a9fffe923544f111a36127e5ed4. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/USUYG1452084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f93a61feebc53b82f337363880c32f98d20fa4ad4fbd0568273027dee54e57. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USUYG1452085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8184ccd7c49732092530fb783fe75516fb1e80eab43b2154cc695fb280aa39c. 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/USUYG1452086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3ae89dcb74ef0ec17d74b330eb2c0bab2158f856e25fb6ac5fbd30299e1bf6. 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/USUYG1452087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba3d89669a565a49d787eb20948bcfde67b3c944e6544f16b88867aa1c74882. 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/USUYG1452088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd299ab06aac84fa15477970d0945fd6890beb5e065ea90f4e32db146f4a8cd74. 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/USUYG1452089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab5d519e580d0dc8ec504d0bebf0b9165f0a428546b0645eea2e0a429b988da. 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/USUYG1452090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa541493b73d348ffda36426cb0f3bc009832974bdb19055b8f655b1ae02784f9. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USUYG1452091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5760e4ed81642f993c1a07084e2855c044eabef4540a1797564db8bce82f60. 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/USUYG1452092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9353354d731cc748717daff52c99b651eb91df8e85c71489ee64b2454d373bde. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUYG1452093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb398e70b73e78a2f03459508381055e10452f902fb25567635796f8c9c7e2813. 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/USUYG1452094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98a4fa4f18dde198fd2e8a443a04bfade078c8b90fd8163fcacab62beb00958. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/QZES92435208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a7bea4eb961dc34e3db49c8e42b80020840bbff9c8db7739dd8504b60d9224. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/AUMEV2552505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81555530ec6c9db69f5f41ac4d448dee2d1e853b328ce77c0a118ae2ff50c6c. 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/AUGBT2505689.