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 0x3a0e808f1ad3480b493b07f114545ebb268be8453b9f59b572a22e3ef4a904fd. 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/f628e01e-2293-4b6f-8cc0-b5a0fdc1d65d.json and https://artists.proofprofile.net/proofs/artist/f628e01e-2293-4b6f-8cc0-b5a0fdc1d65d.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 0xb9e4cc23467f9c8f91b61b8d107b12cdf15872d6d36ed8eeaad391474c1f88be. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZWFP2451200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8812f5154db4d2fc7e7f5e091ce717989a75ef567dafc5e0bce3c5cb2d466b5c. 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/QZWFP2451202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bdd29fdef1f1690aa20ac54598c83d3c10075238b63513801773ed0f1234c9. 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/QZWFP2451203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efb4a072c3df1e758c37cf8ac47b858138d18545d38616b636020c51cc7b5ab. 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/QZWFP2451204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9df1162547866f84c7fa2624f0ce8a9322ace5b5c7ff2696804e5da3968a167. 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/QZWFP2451205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c195a2c22b3c62ba0c160f432b6f8a6fe9056e7b5eff5f14c5896d1ea15a6bc. 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/QZNWZ2358878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd896a48c3da03ffeb8842725d778b156bffb9298283ec8ead0882a46f1015003. 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/QZNWZ2358880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3530f7e5011768cf7550497fb71a20d558d209bf183d2726d192baf5a594c96c. 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/QZNWZ2358882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e934e8a6dbc513802fc3f6ff9db5bec3b2dac15b408ddb4fe2392d98d0b7d9. 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/QZNWZ2358884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8a1584e8f2815c9ad5169aab7606d8ec3ee6c695f36e113eb657d907ae8343. 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/QZES62313984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4d3bcd6f3f880f78305e5eba61a40d21ec760e682fb1fc693b740c4b65e4b4. 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/QZNWX2218350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12b3d132a60cd2b5f5648a93c5e42bedc771b4c3a7a64509717bccf1db8e703. 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/QZNWX2218359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3a1f55624c365264f1ccf4ab0bf32f08d01ccbb07a536772fc0d0cf89c8393. 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/QZRP42194117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0705672d7ed451c3b12162a4d312d8bf06a33f1fc87a8de7c5e537d99732c2. 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/QZRP42194120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cfec62eca001bfe87527d603d7a5ff279e1768c8ee9cf6080e1a65603d97b5. 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/QZRP42194121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9893adbef2879959dc78bb2e4fa157ccc134e2d2a345c6aee385595635e5eb. 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/QZRP42194122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7126a1a1f1b7d626af0dbe65f1b4239389fef712555b17569478bb383dab82f1. 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/QZRP42194123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7998b916b3dbe8203491a7f4e81eb987fd9648841f9a23e3ad0604a257e7313. 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/QZRP42194125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050cced279a386d92e18a3c9d6e0de9a8e7fac9fa3011df0d238d9e41d5a005f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:59:24Z), 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/QZRP42194126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9111dea7ba5d88dad1c05888c5996a12c8e46657e548fd73f57c2329306c0e9. 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/QZRP42194128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ef6bf8063c77f342c2a17382cae3c3e230c5b1eb1e1761bdde520f382198f6. 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/QZRP42194129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbeb269c4a64bcb974ea67c7daac623a262766f95c46dc1f477121d0c784d814. 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/QZRP52470850.