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 0x840dff5eb4d048b54f96ba306f85a3168385a52e7d448d6c20f85ece67f7f3ee. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68db414d-d803-4fa2-8d15-c559770fc103.json and https://artists.proofprofile.net/proofs/artist/68db414d-d803-4fa2-8d15-c559770fc103.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 0x8bde8211ebf4684d14fd2e1aaee3e7c5b311eb0bfd0585b484b8fc2481d98453. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TWAN78800148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab9836fae71981fdf614ddebc1204a5401f865001b059e8e0d7e50e8cf0d73c. 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/TWAN78800149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15240d1a916d8c0ac737abe9c4ced2187294ac2ded875dc698243d9d99634bb3. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWAN78800150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea72709063df5ee57a230cf8b0d4935e997bb99e6a13afa004a7853c0b419ec. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TWAN78800151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f366f9e6c1ff5db47a15ec57544fd9fe8b9fd91411481ed6008843ffdda864. 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/TWAN78800152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945c4ad0f7b9f0bbaa6c4da4a309327a8b6487b374615c41013c084a2e719e1c. 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/TWAN78800153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48c6212defe6f4edce640428c891abba9087135eb7e6ce453ddeafb12c681c5. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/TWAN78800154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2f61a81863c7ffa7bb11a10f25c077087a22536ffc8d5dcd3670ce0ed7022e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TWAN78800155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04aca2347ffa136cbb78a6f6e214acf63392fbcc78bdb2c48bf30830d2ad5a46. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TWAN78800104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23c23414aefcf409136b4d8274e7d532c6b3f00e80d5edd0bfbc973847f61c5. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/TWAN78800105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454cfed4c0189b3aa9ee38333c3898384a089626874771a39db2f5dc7dfb3805. 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/TWAN78800106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12ed642747577c0fa4b63223d958cd22a421ac847bdefef4921f24730a5d013. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/TWAN78800107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd68d06494ff744022aff0a9074e703c99d2f7e117876eaa78f1d59829faea9. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/TWAN78800108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086e6e325aec1762a5d17afc1046027445607620412816b0bebb1bcaa2776ca6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/TWAN78800109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d25389bc2caef53f8048c91ef68450d4faa0be90e77ba4b8bd02d59d32ae113. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/TWAN78800110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72589d337a7c1cb22aef04f57368a80b90cc3da57669bf7f9bb098fec3a7c8fd. 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/TWAN78800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ce9aba60e354313e1deec4bc687e4a009ed5c54b90a2b659db57826ba3b691. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWAN78800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16d6eeca18abde563e8a75c013f765c3ac08a01a8e11323e5c40b7c797982f8. 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/TWAN78800113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2b9e3d3985658649eeb10cfd0bd2d1afd7c85558173352c734dc4485634716. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TWAN78800114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d532870b9d064ace05dc3e0c045cd5e76d741c4911b013c611a9d464db7a914. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWAN78800137.