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 0x8898c393334655b504c74bb20f50c2928a049cb8a2226861e68b87428916af3c. 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/1581b86f-62ac-47e0-a1c2-f00800f57a20.json and https://artists.proofprofile.net/proofs/artist/1581b86f-62ac-47e0-a1c2-f00800f57a20.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 0x37e26380443eb24606de98515ffaf278624bf5c1066add57fc75a99e7ebc04b1. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZDA72085650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81efba83eabfed0b333b08c9e1a2852df998efc9cf394c0d6ae4ea9d130275f. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZDA72085651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8917149cf9077a38e1bf648159b84673061aa93eaa4e1d5c5e3b85e78b15a881. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZDA72085652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aaa9969d33b14056d97c02d56dca8077c3b4b718d56711fd2279463d95fffd9. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZDA72085654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700648538c016c9962daf2be13f49e3bfcea3d056f24a43eb6238f5d5d31d806. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZDA72085657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d367f22400b11c459b170f3f7d989fe9c76dfde10a76694ce06a794c1ede328. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA72085661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d13c01f3bc4672e642a363f6e80dcadedb9e86becce799cd3d04e18251e02a6. 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/QZDA72085664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231090d33489e9dfe97a74b5388037b463ffb90ae915b5138ab2ede1f39922e3. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZDA72085667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2564b72bdfce7446f94f92ad147310ec5d4c59e6b888eab1984d82b430fcf39a. 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/QZDA72085669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49de8d856a76b1cf4287f3bca3ed211d671c141400db9bb98c29e06a4707e33a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZHN91970692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a450faf9a7274f906c1968af828b1b37fa730a478ca31f401b5aff50a869c8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA72088301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5045f4a52b39ec6945967fb30c9b865c92400ad09d09b7eadbc7aec266af8175. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZDA72088305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc6f0051a240ad50e6aebc1c9ab657a14693ca2e5764eeb9f610736cbdd1bd9. 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/QZDA72088307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5567f29aa9a59e9bf303f248876bf6723a1467464e4e0fd3226dbc7afbe3da. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA72088310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb381bd5a9c4ecfe120e3b1fb6ac635409ff26a1ddda42c6867977428b3d8eb. 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/QZDA72088311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b47327e1631e1b7722a0a2c6ad1b8104f999370a58dbf9bf6c26fa8ff37327b. 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/USA2P2038757.