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 0x3be1bd016b3c8442a7b41a85d90d2807a4418345b5f46beae847b5b9cc0b1624. 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/21d2b585-a6e2-48e1-b5b0-2ead0be05c97.json and https://artists.proofprofile.net/proofs/artist/21d2b585-a6e2-48e1-b5b0-2ead0be05c97.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 0xb80554a948268c7dd94374d63abe7f92881272e3ff951e3b5e825809388fff10. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QM3DF2210452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9350c195752f1af3a5e73131b70e38c680f412e0caf5e70661ee72256b9732. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QM3DF2273877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8e49dd9f28ce295caf9b217f70400c7499beb8646d75bd5a6a0806f6351f7d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QM3DF2273878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f3b6ea0cc6dc71cc4cb93c9c92ba166438318cf7e4818e409b0382938fa03a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM3DF2273879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cf422517200473a26447610104afbaa5af1f74b48edaa74773d052d6ddf499. 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/QM3DF2273881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e14c2d41e615422cf8981580d2f64a59e6e584685f92f0c236a5e9a909aa7aa. 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/QM3DF2273884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8813919a23245e1c03037979a9c85afe390baba39706e6964e1009ec615bbff8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM3DF2273885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565c48fe68333267c7a40afa40529a3a4fc1039792d026d4a7e8daa717438d9c. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QM4TW1733295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018645777322714cd5587071b72bdfcee7df8b65b5d91cd6141e0a8a5d65e7e1. 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/QM4TW1733297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd76e09a6f743c7cab36e22fa66183ccb4d779f9187521520cc5c1e0dcbb8b10. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QM4TW1733298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66846ec05c6b0ab4dccfef3e3e797e883c1fdc2e51b73b3c1651d18e3b62702. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QM4TW1733299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f70061bc8e1d524016290ee5be865ec47507159dab2de3e5f690b5732603b8. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QM4TW1733301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc979f99a3d0ea040c0ac9fd1b006f9c929ca686d52d874f4c02021b4f2cee7. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QM3DF2210416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe504e0a972eb491738be953e87d410ecb7773ef5b367054b944b18daa7137861. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM3DF2273831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93532eb66d57574b94a71b7d2feecfeb0b47dbd3721829673923240012c94eb5. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM3DF2273832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bfb32c8f59883a616bb915043a219b664b01376331fe327129216f403d71a5. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QM3DF2273834.