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 0x01479e012e5c316142d49d5957ef716dadf766c83f8e06653fc30d48a0d328e5. 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/e7c7d91c-62ec-4036-aabb-1cc343692fab.json and https://artists.proofprofile.net/proofs/artist/e7c7d91c-62ec-4036-aabb-1cc343692fab.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 0xa5c77aec26ebb55bf59ec3012e80ac3a5c54d2eff1515c0897a82b3f0d570b83. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USDHM1805952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55eb96e4c15778a42f415bcc049c4b4a82c2f03651c97f6069b4e8907645c135. 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/USDHM1805953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbb750df00ad63a732aed973596281c721824fa63b8129885248c49ceba01d3. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:01:24Z), 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/USDHM1620907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f437add0a6c9d0ed76e358ddae2b67c2dcc1ec8eef6c44ae7644b65cdf6f405. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USDHM1620913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd47988196c5508936666b6a989c934a61e192f0b822a1c9f6bfd022d465e4a. 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/USDHM1620914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ca0513f5290a9c3eac90f344ddb4c5038fcc988696bbacc253c2abac6dc275. 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/USDHM1001993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88945a827bd40861f716d795a03a4e72d0f220432e7de4ec2b86fa4ca007126. 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/USDHM1001994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f5e8b6dabf30804e7b1309f6e8e2eb6f0e22e8585569a7cc19be77734a831f. 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/USDHM1001995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bb225c751ad7590b5fe28099303fcaf22da9a69dc5b70cdd51845efbda6d60. 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/USDHM1001997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020c665b70bce32a00132f5178d9f54957fcbfc66788baf184a7354a8248a7b5. 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/USDHM1001998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8addc3023ed52feb6b751c532b03fabef7a251f3b1a26fd93923e13759cc95. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USDHM1001999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea3d713e14f14dc7440f4212bf295a9042246b5d8403c2485ad82b04e7685e7. 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/USDHM1002000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec4ed8443245402860cae9190592545668fdda2eb740dfc3c8a321d6c0362b6. 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/USDHM1002001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7366300e95e7d838b28e4acae4f966dac68f023a590e30ffd8b662a2b72403c7. 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/USDHM1002002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f83f927f2a9be9d055ee59e8869cf5a8c6d7423cda19d95fce79d610c5cbfa. 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/USDHM1002003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20876c0eda66989ce4746d3a6ecf8f606cdbdf3cf15829789bf17db9338bb2f1. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:49:51Z), 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/USDHM1002004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5849dbf6169f5c7ef34b5d76468a72daaec89c3fd433faa4fee195554fd5dd90. 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/USDHM1002005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa751157c1b486930d59b509316afbd3a4272bb05738bee784c74d7804c227c0e. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:29Z), 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/USDHM2305239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810751b4ea33cae10d061cc5bc341d170ac0c7034e64e31c27c4b242718815cd. 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/USDHM2001258.