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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e87c91f8de36daed57933a887f7f0e29e80fe788684442eb5c4afd03af50be. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/297097f9-3f9c-4d55-ba32-fe8f99fb2b07.json and https://artists.proofprofile.net/proofs/artist/297097f9-3f9c-4d55-ba32-fe8f99fb2b07.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecba4621ae96d8ab5439b2750e4413a4b711dbacf0ebaafa6229e9deef2d05d. 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/TWEU32300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5465f34cfc2f45d0363d512df50057b2d6fe44c8997d3d92e8935d3443416b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWEU32300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee0b97d0f842d5ef7e5931bc59a74df2a02084609c08f2085e638311ca89a4a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TWEU32300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd845c0e4225467d65d84719f6f5c03db2170297bdbe0ff3cc560402743e4555f. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/TWEU32300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4a71230c8a015451a6f530b02c1309614cf911038436962a919b474ba9154f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWEU32300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973d90b61186b118075dbe592b370153cc841638e287fcdf6e47772a4100be95. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TWEU32300002.
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 0xae7c5add66a1e7815b9d9c7affe6b5cf1f2f4478d3083b01d0bcce676639e700. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/TWEU32300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc93b296f21ead94578daaa602e5c74dfcbb874e4cdf95524b4b807967be168b. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/TWEU32300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa461308ed8a17c03e9e6883a7af978e8b6378ef4fda1cf08a7fb374dac1ab0af. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWEU32100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7050ec37251fa0c63ad7fa0b8234a546aae3e037e9b0df5a075792eed90849. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:45:03Z), 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/TWEU32100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075e1df8b70bd29b6afeba3f92a47314666be044204c60148e263767b54210fd. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/TWEU32100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1e26373a8f2bd731eb3c34710a717a8b392b4c2f99bc87a57475580d9913d3. 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/TWEU32100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b2813a41d0b99caee800cba511aafbb26a9ca65677bc9c57204cd8d8fb8ca7. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TWEU32100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dca32ebcd3d872fb69931ac126b86383fcfce88d7a9ddec3939ad8cdb5017e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWEU32100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09082474801374af52dfb8a404c5d5f4440e9e455aa345a5b41c407116c89782. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TWEU32100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0903fee3f471a8e0379673ac55b5e55378aad4013e69d21d69ec006d1e54df0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TWEU32100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2c9fd95d4743d745c1b2886a53e59d38a8e24ce39295274a9bb03b1638bba5. 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/TWEU32100010.