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 0x4900f1d25789c884c317557d4bb9ea957051a93d55a8af88b4f7af9fb72e6d92. 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/a077e93a-c684-4f7f-858d-7f9516547233.json and https://artists.proofprofile.net/proofs/artist/a077e93a-c684-4f7f-858d-7f9516547233.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 0xbb3f056b5280d690cf54bd37c104cfb7f1e1dbd6efb086e0d8256ae4737acefa. Chain 2 (Bitcoin): anchored in block 957540 (2026-07-11T08:19:50Z), 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/TCAGG2213543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafca763f38dcf5ce90a421c75667568d68e92d3d320c1e1ef5fce7e1a2f0d13. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZNWT2230464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294f731ec42a470636f8e5c61f4f25e693b1600e46cc5c50842b396c11fb82f6. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/QZDA72325863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c76e7d14c1ef8340afd5f2206f868f20d4e04031506bfe85612e4d51a4e971. 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/QZMEN2396727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528b14924eb351ee06c8f35c6df1d259fbda77966f1c2d8a17ec1a6d78a9bb40. 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/BK4DA2402604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa4cd74d7fe487631328cf59de9c9899357b1559dcece38c6d279000c6652c1. 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/BK4DA2420584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989a7f3d1be17179e962940050f22b5308737691fda25ada66de31ce39ba9ad5. 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/QZMZ92510238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3dbabab26537cbac3e9f7d384d519b103acc698bb564ea9b6398feefff9a87. 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/QZNJY2517065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c8ad3f7efaae01a1046f37d920d12d3d9a68339a83194bf31fde39a19d19ef. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G2318517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2556e0ff61d576f3b01d44f706e5bdf1c036981d3151a010d958f48b8bd89176. 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/SE6XW2322724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd835992b6b6c6554b236b69db80c055c59bf8b5a9e6330935ee3696c37f44d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES18B2301592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4291761224b51bfcb30da200fc461e074bf96817a9cd72b39fe93c0a217c2367. 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/QZNJY2423698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88847d284442fd7e0bec705b482ec04e2a97ca5883bda25a3b9e71ba84e93057. 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/BK4DA2321447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cabecbd2d4ebb001d69e6beb6aff66e70a932997b4321a762f293150c19c62. 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/QMBZ92427268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cabecbd2d4ebb001d69e6beb6aff66e70a932997b4321a762f293150c19c62. 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/QMBZ92427268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d9ecf11c06ded6b91a93050e729a8f19b2c7d516c415ed272e7e953b4b71ff. 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/BK4DA2458965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffedac7b45ed50968ea209d277855fd9ee0aa1b251ff4a8319bfb9de81194bd6. 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/QZTVM2413453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cc0eea09b46d3fc0b868bca9321e3d6bc1972ace3f0cf67c48bf0eb7523383. 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/QZWFT2467658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293367d7fa21fad88b1cc2e5254d0ca60dceec8740d8e823ee3be55580445fdf. 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/ES5152401065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638068cc315959cfe4c89a5cb47a28dd697770f62d005c2e4bba67ba731544af. 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/ES5152500554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120616c2f7676eefe83fca446a8f76b6313132c55fe23c340ae158b324f288a6. 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/QMBZ92403667.