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 0xe78e0a7985965e0423d1104452634de18ebdd80f3147f935482a0db365000c80. 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/287b3e38-f785-4633-8915-50a8a7f5b37c.json and https://artists.proofprofile.net/proofs/artist/287b3e38-f785-4633-8915-50a8a7f5b37c.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 0xa439805c112bd95573d9ef6846d5542b8a5ccd514cc2df3b122365e56b6acebe. 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/DEQ021910526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67db086b68e509494e4078bbd67ea8f615ef077a4b29666c95bdcb8f530e02d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DEQ022012635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe465fe0e579d2775b3cfa7b6770e5bf7a29f2cd70db0bec5fdc585a33bad7b16. 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/DEQ022110834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa258ff050615c4605b2ffe8c10a96533d05de756d1c7ac5e800cb918d64c91b1. 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/DEQ022118020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb0fd848fa1a28601004e046f09cd6de745663ae15fad9054ac80006928903b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEQ022151316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fc6330a0cbc73e1c900af4026767a0cc25c02f4cbcb1797024c7dfaf5685ae. 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/DEQ022118362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8117b66a4e2f02a1d66f3cab1e2b44a25807a2905c3b4569f27d404e4645c03c. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/DEZC62251960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c75e5ddd8d954a71a0cee4d27d1283b746c1dad3afac65470acad9b907fc553. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEQ022281565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae145f6b5aef7684e9658cde677816bb71b6c35845bd206aee780e4e9227274d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEQ022276253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf738c604faa4e2bd3bdef0009d0bc136b946100a00451670ef9802baa27514a. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/DEZC62334549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4edeb22b4e29ac7464ee0a214ad0be97d6c7e9fe4c6db18edea4dec48df7f5. 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/QMANG2220655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4edeb22b4e29ac7464ee0a214ad0be97d6c7e9fe4c6db18edea4dec48df7f5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMANG2220655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d57740824a4ac397150dd80aef0db90bb5c7eb0d2bc648b6a60732657a5ece. 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/QMANG2220656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2835ce7af4a408f25a6fa0d3edafd7c07012013d7c0bd7b7fd1f848a77ab9cd. 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/QMANG2220658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffed0acdc81ab4fe3050c8a6972d1abaf1401e68731bb67e42e4f71eda3a5aa1. 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/QMANG2212043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60659652402ba89efb7dc2254bc496fe620c0288c2997c2a0ff6c87d8c7432b2. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USANG2415492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51432e229d8f557c3035d95a97c159201684ad0aad4af9eadc7fc2ff068c5c83. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USANG1924007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194575556fbb369e5eeee1db7a3bd3a4cbe032e62743a5844e92faf7b27a9c79. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US3DF2076777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96092f6a2b2e329e2608cae1f254f88215a960c73b5fae2a40d6ae38da64a9a9. 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/DEQ022291233.