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 0x266011f299b3e09cd71122d81870a5d8c968b6c36c50c130f94ac8f1f78b96f7. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/afd6b314-d123-43aa-ab65-b010668c95c6.json and https://artists.proofprofile.net/proofs/artist/afd6b314-d123-43aa-ab65-b010668c95c6.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 0xfd7930ff1e2dd7d958c6d1cc8bc6832c17f39efd15a00a9c52c639d433920769. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWZ2506793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063457f2331cd8f72013d3a847d705ef3bb9c51102fba96eba7fa568f2bd86f0. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZNWZ2506768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8635817ae37662640020339bdf899327bf09e573d4a4d8410e136dbbcefa90de. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2506771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97da60107ac7ff2b64184c43fc564a80c19899f782e3fc49e84d97973cb0da2. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZNWZ2506734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a21fe6a2eb33d26d3dce2fa303ebf9a35b8a3cee17b44674853bf57a222e0a2. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZNWZ2506729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6b2e64f452ead1107f5ea48aa752270f01cb0095e4294b5a682bf7733c9268. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2506772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36e2996612496a4da33db1069e54b8bec7c0d2717e01117f0c242d30b658669. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2504372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0556d99b127d88330659a2c3f958af0dad72ac9c64b88c75d9fd684fc3ccacf. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZNWZ2506763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e1f9a4da24e157eab5e612b420033989a69201626eb5554a2aa71791a45d5f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZNWZ2506794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108de811bc60df16391496f137a61738ac3ecc600e101c83daeeba104a124e7c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2506769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aef99ad0981970aabb1e9a3513de7776353a63c859e944fc8685d7bf7d18e57. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWZ2561201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d422b59721ed6acaf6ce65a5d78e6546c0a7a9cb2d7b84415aad980c26505ea. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2569968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335a752595d20a9d3f960fbee2be48653a772814f17292c2aec7e23389614d65. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2558855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2567bb5181303222575bda05629f2bedcd0fd7302f35bc2bfda04362cde150c1. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZNWZ2556741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ffb75386017b76cc49e6e8b15c43c961f518271cef3ab7ee037913ddfcc286. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWZ2569969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c5b584ba98a58877d0f9be0827f8c7c2145b8182d86778b8940253ea4bfe76. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWZ2566858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f83706991ee1a5fb4b17f17976673fc619f15ea5f7c7694eaabff0a4b71bea. 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/QZNWZ2573830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3bd50d501903837773a069c24590a18bd48facbc2a93df88c6ec0771b0b046. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWZ2556656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893133c33ed4fed2ed5879e1d843454150a101cdf22680bb466eca4953831544. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZNWZ2558854.