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 0x215ff71df21bc291c56fc644144a69cee383967b8dbfd279e459efe8c53f6c65. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52ae6ab6-9460-490f-85d9-326cb38e6b1c.json and https://artists.proofprofile.net/proofs/artist/52ae6ab6-9460-490f-85d9-326cb38e6b1c.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 0xb30ca0d4cdff081ae12355d0842922497a7191913ae2d9fad91943e2960b3617. 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/QM7281536868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d0b711fa441118965005d8d5dcb03ee41afbf2bb2662c5b2b5a0736caa70be. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QM7281536869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599d903786009cee1fb2f84eb22b09c6f3453655d1e723fe3a2612e2ac528abe. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QM7281536870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f81b08972b0317cd896310fb26b1ef5518fef9c26fcbfe1bbea78bdf0ce0b38. 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/QM7281536871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62da1c907af7bd1e63c406aa41598e198530da5ccc33ed27c04575bcbbd08dc3. 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/QM7281536872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39bf0f28f39c1eee9957e0ea2407d453bf25086dcdf8dc892670536030d8e350. 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/QM7281536873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa486ce8d6b77bc985236508bb2e95c695bda274e1ae5e6e306737b010a07f272. 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/QM7281536874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f44e7647b6dfcc687d359a99c1646f01e5fbbc42bd5ecd4e763e654bb13affb. 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/QM7281536875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5990423486f8635651613a641fe00bac794a24bdac9095febb4bcd7c847eec54. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QM7281536876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d164f4b13e80293da0c66b8dcffcbdc17909bf349ac1dacca96e9bfee0d702. 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/QM7281536877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a9858d1924fa56cfb768deb5de217c352ef730aba9144c529519f8bfffe09f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM7281536409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907e3cb4ef5f99d438b52f8493ccaeb7afb7b5ee99c76003fb29662a71c91871. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QM7281536410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c292b3f024965d6223ba71745f73a355648da4dfbd33a33c8ec9e0205472644. 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/QM7281536411.
L.A. Blues Authority Vol. V: Cream of the Crop
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb009b666dd120235437b9c8621fbc23ce1dae1b21f01ff84da4962c59efadef. 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/QM7281537093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15439137629627e96475a55bc327af810f2811bb7d3fdb54eb740587c8c00b1. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM7281537094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0686e72d8a86d5e6149d2cd770e85fe77fe059ed116549b488c7c90afe9ab5d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM7281537098.