Roller derby is a roller skating contact sport played on an oval track by two teams of five skaters. It is played by approximately 1,250 amateur leaguesA Roller Derby league is synonymous with an indi
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 0xbe6f31446a85882c32844f95d35dbef657188d67173450b1a993d47d5aef45e7. 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/e0d21190-0fa6-41ce-bf9b-ed878d71da86.json and https://artists.proofprofile.net/proofs/artist/e0d21190-0fa6-41ce-bf9b-ed878d71da86.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 0x01f717a92a67b74b4eea0965af2491d55225e7ef7d6396ff69f97ef1f6b03aef. 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/QZMEM2049475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ad97ab0fb2e95b175f69664c744899b3d28b3727d9cb818050ccd3b12ed803. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QZHN52123704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5eae18d977f921c32a298bbe0cdc0c82569ae48847beb1ba7d2d6a9e566f48a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZK6Q2105790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1fd0f7e03164ff71056f6f6f5bdba86363ea9c5db09ada8b04bf6420857798. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZMEM2150969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05225fc02d9efe86c77616fa02f46ac67d33bbcff799e6cea7d626f299218a7d. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/UKSR32200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705d2acd82b558e7a5efe8ba79711ceeb58b1adf76e4006559da36ed3297cbff. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/UKSR32200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705d2acd82b558e7a5efe8ba79711ceeb58b1adf76e4006559da36ed3297cbff. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/UKSR32200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05225fc02d9efe86c77616fa02f46ac67d33bbcff799e6cea7d626f299218a7d. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/UKSR32200022.
Can't See You - Reeperbahn Festival Collide
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bdb1d88f56321c43bc8271ba0ea4fdb78f9c5055877230a47a6f8ae71796f3. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/DEPI82301421.
Friday I'm In Love - Reeperbahn Festival Collide
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c225d013e82c1d2e152f3288011fef5b90704421743846aefcb8658c813dd3. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/DEPI82301422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa815f7ad9096e12099e0a175ba5363554bdc419f4c7b7945228c7c4da488d791. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM6MZ2454770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a736372b3fd14c9c6a85a8e5288489848fea0a9670b26ae58ae796105546379. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QM6P42420943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ea45d82d70f15b593c6e0eef47d7aa8d1d0be67f2213ba16a5b105de092fc6. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QMBZ92458164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ae3df3a6f14b139e0acfd4710b3058dbb05145072e9df887dd8b8442f6c2e0. 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/QMDA72454108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ae3df3a6f14b139e0acfd4710b3058dbb05145072e9df887dd8b8442f6c2e0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMDA72454108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ea45d82d70f15b593c6e0eef47d7aa8d1d0be67f2213ba16a5b105de092fc6. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QMBZ92458164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a736372b3fd14c9c6a85a8e5288489848fea0a9670b26ae58ae796105546379. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QM6P42420943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa815f7ad9096e12099e0a175ba5363554bdc419f4c7b7945228c7c4da488d791. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6MZ2454770.