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 0x12b80772389e0d9fa96e3b96105300808f2c00f6cea0183775a4751d5fcd53d5. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a58a89b-711c-456e-87f0-fb489114757b.json and https://artists.proofprofile.net/proofs/artist/2a58a89b-711c-456e-87f0-fb489114757b.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 0x39b4a0406c79f79bc1602d688b6df6de711d1ede81b767e75d78d4052b12b868. 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/QMFME1598458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce70c5da099252cfc05e645b042c145f9a703df31c9f1554d0b70f9cfa23459. 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/QMFME1598459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690c4a0f5c5acbe41794697756d43f4fe18887f0b7aaa5a19080373cc00e7ad4. 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/QMFME1598460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f6f57ad5125fa439f6f479a2bde0554614eadf81c46cd49b7d21db0b616d09. 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/QMFME1598461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f1f723044b9885e7560feefb722ffd91e31c4ab25be8379254f366e209613b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMFME1598462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8825719df8a888ba7257420ce932653db5175c5c4f3c64c1e1fee08b18bcb726. 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/QMFME1598463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf91785941452ac7d5c5fe34e9307d2458de067358f2dd460c19b4218037d5d. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QMFME1598464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec8005a2d84d1b7d775ae3e127b23cba804180717b3382d0b227c53709874fd. 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/QMFME1598465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd644298dd886946f259161d62d6501436f2141fb0b69db8c23d14280c9c1194e. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QMFME1598466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f31a5187746a5f97603be71de1df824726b5c46cb619b39aa01fb4285a391f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QMFME1598467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd855040501bd69fa0a563ac80c2bbc8a41eff00afcb14577fdf6457f76b38d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZGLS1956805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23f4a16adb2d0af68b693e128de70d586db0bf95c3da2af69012285a52bf83b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZGLS1956806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b637a3a7c3855992ae8a1d6c50860542b0f863abbdb1c775a590c9d8125459d. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZGLS1956807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4ef5f3bbc749b79183872651d9de2a21d34f09b102057c1678ab124388f7c4. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZGLS1956808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc486fed65cf040e808bc9af9a501dd3f397b6731cded3c68a36c01721efa4542. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZGLS1956809.
The 15-M movement’s. Songs For A Popular Movement. Puerta Del Sol, Madrid, Spain
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e70e77075e8b9c9ce94d316b233472416f9517884a20d86635ba43e5f831f59. 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/ES5631104583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6dd77c41cd726e9a0e17e341ee9c33875c0720c7b6ebae5b04b9f82844815c. 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/ES5631104565.