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 0x0245fd09814290fcb5272ac46163bbd26543df9f6a0288eb40b6a6494c2ef2ef. 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/932cdde0-fff0-44c5-9296-0aef0b8606bb.json and https://artists.proofprofile.net/proofs/artist/932cdde0-fff0-44c5-9296-0aef0b8606bb.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 0x3db1b65a2a5019ad478617c535e949d3dda7101cc2f05c442604114e90b43c12. 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/USHM81820791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd3e780fa853046c56530924f038a5015aa1f3728cde278eb7ca4bb336bcb11. 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/USHM81820792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81af10a585f3c37755ffd09f1e1e4bd0f5bf82be440bee574c566e3ba9cafe5f. 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/USHM81820793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5681e94eae762a6a5f13a171f6c494e74c8a85f58cc565e3032ca55d8eec26b9. 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/USHM81820794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52c4b7379ec1dffcb8b098fc6425e260d0f14301197d57852ef156c6c7de48b. 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/USHM81820795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608b08753ab8329098478f0f8dac89c60493c043f42097b098420142bc762698. 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/USHM81820796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcf0e71c23813a59b996583262d01052bc3139bd66075cd7a997e6b192ec43c. 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/USHM81820797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a59dd929b8dbcc8e6dbc9fbfa80ec05f13f7d37959a90b866659a54efa69df7. 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/USHM81820798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf85cda53aa4af4a2d9c17edae4d15992da58387cc046c3e74f3d5d2436db307. 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/USHM81820799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d0e39239a75af276087922b8d9d50339c2daecb802c4ce0ac79162648998e6. 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/USBHM0810052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52647c80ddfd5cf5c1f8b1df84f4dd86292ce34c395bf933ac977a5445748f71. 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/USBHM0810053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec0f611cd0d560bb8b5fa46742c231084b3233336b88b4d1b57329a763ee2a5. 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/USBHM0810054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8990d39f051d853bc1cb8231d56b42b2fcab392f7e02a468b57a983eadd85471. 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/USBHM0810055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e03608cd4798eacf7b92c5d45e7a6f5ac28aa5e5943b1cfae9486a9dd8158f1. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:59:52Z), 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/USBHM0810056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5573414f0f0088534e4d7e4f223d968481ecf4d96d5ccdfb094e937d087c29. 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/USBHM0810057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41a270eb9283be94afa8a37009fa1a1f203e88c3d2b34fb0490a26d9918d128. 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/USBHM0810059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cbc9128f935d2ac07b59f3522317f107cd63d56cc91e89ca59d0aa56541ca1. 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/USBHM0810060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc017c5cb1bf3a0307293774b1d40ec16301b17ce5bc4c6c6d5bc7e618e56332c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:57:42Z), 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/USBHM0810061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919fad586336704f2d2cb54ff25b2a1d0e004b0fa8301b7f3d4abc11ab4097f0. 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/USL4Q1886918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee035ded48dfc63320fb7b15c04a20dbfab4c9f851cf5b280d846759b7971e9. 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/USL4Q1886926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc1ad3b36d1215a448da4e7ab255782167ac1cf21e29d4cf3ec15758ac09363. 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/USL4Q1886928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefcb537cf8f04aa55562ac3c705590d4ca1db3a99ecdf53b218efd2c855abc1. 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/USL4Q1886929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71e04bcddd41e8a42a20c2f64a3eff85271b4e6a08838cc2a9715a6657bf5a6. 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/QM9A91691553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b97371cda6e489bb1bdc567ba7b6145d19ea3b4dc3ce3694315bdecf53516f. 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/USHM21466054.